Building management system with machine learning for detecting anomalies in vibration data sets

ABSTRACT

A building management system including building equipment operable to affect a variable state or condition of a building. The building management system includes a controller including a processing circuit. The processing circuit is configured to obtain a vibration data set related to vibrations of the building equipment. The processing circuit is configured to analyze the vibration data set by one or more machine learning models to generate a set of probabilities. The set of probabilities is related to a probability that the vibration data set is abnormal. The processing circuit is configured to identify the vibration data set as normal or abnormal based on the set of probabilities. The processing circuit is configured to initiate a corrective action responsive to identifying the vibration data set as abnormal.

BACKGROUND

The present disclosure relates generally to the field of buildingequipment for a building and more particularly to analyzing data setsfor building equipment using machine learning.

To ensure building equipment for a building is operating correctly, datasets related to operation of the building equipment need to be analyzed.Typically, said analyses are performed by human analysts that arequalified to analyze and detect operational problems related with thebuilding equipment from the data sets. However, training said analystscan be expensive and time consuming. Further, with extremely large datasets, manually parsing through the data sets can be difficult if alimited number of analysts are available.

SUMMARY

One implementation of the present disclosure is a building managementsystem, according to some embodiments. The building management systemincludes building equipment operable to affect a variable state orcondition of a building, according to some embodiments. The buildingmanagement system includes a controller including a processing circuit,according to some embodiments. The processing circuit is configured toobtain a vibration data set related to vibrations of the buildingequipment, according to some embodiments. The processing circuit isconfigured to analyze the vibration data set by one or more machinelearning models to generate a set of probabilities, according to someembodiments. The set of probabilities is related to a probability thatthe vibration data set is abnormal, according to some embodiments. Theprocessing circuit is configured to identify the vibration data set asnormal or abnormal based on the set of probabilities, according to someembodiments. The processing circuit is configured to initiate acorrective action responsive to identifying the vibration data set asabnormal, according to some embodiments.

In some embodiments, the processing circuit is configured to perform oneor more fast Fourier transforms on the vibration data set to generate afast Fourier transform (FFT) spectra. Analyzing the vibration data setincludes providing the FFT spectra to the one or more machine learningmodels to generate the set of probabilities, according to someembodiments.

In some embodiments, the one or more machine learning models include oneor more convolutional neural networks configured to analyze one or morefrequency ranges of the FFT spectra for abnormalities.

In some embodiments, the processing circuit is configured to provide thevibration data set to an analyst responsive to identifying the vibrationdata set as abnormal. The processing circuit is configured to obtainanalyst feedback from the analyst indicating whether the analystbelieves the vibration data set is abnormal, according to someembodiments. The corrective action is initiated based on the analystindicating the vibration data set is abnormal to, according to someembodiments.

In some embodiments, the processing circuit is configured to generate areport responsive to identifying the vibration data set as normal orabnormal. The processing circuit is configured to provide the report toa user device, according to some embodiments.

In some embodiments, the corrective action includes at least one ofscheduling maintenance or replacement for the building equipment,generating an abnormal report describing abnormality in the vibrationdata set, or disabling the building equipment.

In some embodiments, identifying the vibration data set as normal orabnormal includes at least one of determining whether a maximumprobability of the set of probabilities exceeds a threshold probabilityor providing the set of probabilities to a model configured to label thevibration data set as normal or abnormal based on the set ofprobabilities.

Another implementation of the present disclosure is a method foranalyzing vibration data sets of equipment, according to someembodiments. The method includes obtaining a vibration data set relatedto vibrations of the equipment, according to some embodiments. Themethod includes analyzing the vibration data set by one or more machinelearning models to generate a set of probabilities, according to someembodiments. The set of probabilities is related to a probability thatthe vibration data set is abnormal, according to some embodiments. Themethod includes identifying the vibration data set as normal or abnormalbased on the set of probabilities, according to some embodiments. Themethod includes initiating a corrective action responsive to identifyingthe vibration data set as abnormal, according to some embodiments.

In some embodiments, the method includes performing one or more fastFourier transforms on the vibration data set to generate a fast Fouriertransform (FFT) spectra. Analyzing the vibration data set includesproviding the FFT spectra to the one or more machine learning models togenerate the set of probabilities, according to some embodiments.

In some embodiments, the one or more machine learning models include oneor more convolutional neural networks configured to analyze one or morefrequency ranges of the FFT spectra for abnormalities.

In some embodiments, the method includes providing the vibration dataset to an analyst responsive to identifying the vibration data set asabnormal. The method includes obtaining analyst feedback from theanalyst indicating whether the analyst believes the vibration data setis abnormal, according to some embodiments. The corrective action isinitiated based on the analyst indicating the vibration data set isabnormal, according to some embodiments.

In some embodiments, the method includes generating a report responsiveto identifying the vibration data set as normal or abnormal. The methodincludes providing the report to a user device, according to someembodiments.

In some embodiments, the corrective action includes at least one ofscheduling maintenance or replacement for the equipment, generating anabnormal report describing abnormality in the vibration data set, ordisabling the equipment.

In some embodiments, identifying the vibration data set as normal orabnormal includes at least one of determining whether a maximumprobability of the set of probabilities exceeds a threshold probabilityor providing the set of probabilities to a model configured to label thevibration data set as normal or abnormal based on the set ofprobabilities.

Another implementation of the present disclosure is a controller foranalyzing vibration data sets of equipment, according to someembodiments. The controller includes one or more processors, accordingto some embodiments. The processor includes one or more non-transitorycomputer-readable media storing instructions that, when executed by theone or more processors, cause the one or more processors to performoperations, according to some embodiments. The operations includeobtaining a vibration data set related to vibrations of the equipment,according to some embodiments. The set of probabilities is related to aprobability that the vibration data set is abnormal, according to someembodiments. The operations include identifying the vibration data setas normal or abnormal based on the set of probabilities, according tosome embodiments. The operations include initiating a corrective actionresponsive to identifying the vibration data set as abnormal, accordingto some embodiments.

In some embodiments, the operations include performing one or more fastFourier transforms on the vibration data set to generate a fast Fouriertransform (FFT) spectra. Analyzing the vibration data set includesproviding the FFT spectra to the one or more machine learning models togenerate the set of probabilities, according to some embodiments.

In some embodiments, the one or more machine learning models include oneor more convolutional neural networks configured to analyze one or morefrequency ranges of the FFT spectra for abnormalities.

In some embodiments, the operations include providing the vibration dataset to an analyst responsive to identifying the vibration data set asabnormal. The operations include obtaining analyst feedback from theanalyst indicating whether the analyst believes the vibration data setis abnormal, according to some embodiments. The corrective action isinitiated based on the analyst indicating the vibration data set isabnormal, according to some embodiments.

In some embodiments, the operations include generating a reportresponsive to identifying the vibration data set as normal or abnormal.The operations include providing the report to a user device, accordingto some embodiments.

In some embodiments, the corrective action includes at least one ofscheduling maintenance or replacement for the equipment, generating anabnormal report describing abnormality in the vibration data set, ordisabling the equipment.

Those skilled in the art will appreciate that the summary isillustrative only and is not intended to be in any way limiting. Otheraspects, inventive features, and advantages of the devices and/orprocesses described herein, as defined solely by the claims, will becomeapparent in the detailed description set forth herein and taken inconjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

Various objects, aspects, features, and advantages of the disclosurewill become more apparent and better understood by referring to thedetailed description taken in conjunction with the accompanyingdrawings, in which like reference characters identify correspondingelements throughout. In the drawings, like reference numbers generallyindicate identical, functionally similar, and/or structurally similarelements.

FIG. 1 is a drawing of a building equipped with a HVAC system, accordingto some embodiments.

FIG. 2 is a block diagram of a waterside system which can be used toserve the heating or cooling loads of the building of FIG. 1, accordingto some embodiments.

FIG. 3 is a block diagram of an airside system which can be used toserve the heating or cooling loads of the building of FIG. 1, accordingto some embodiments.

FIG. 4 is a block diagram of a building management system (BMS) whichcan be used to monitor and control the building of FIG. 1, according tosome embodiments.

FIG. 5 is a block diagram of another BMS which can be used to monitorand control the building of FIG. 1, according to some embodiments.

FIG. 6 is a drawing of a chiller assembly associated with the HVACsystem of FIG. 1, according to some embodiments.

FIG. 7 is a block diagram of data set abnormality controller, accordingto some embodiments.

FIG. 8 is a block diagram of an abnormality identifier of the data setabnormality controller of FIG. 7 in greater detail, according to someembodiments.

FIG. 9 is a flow diagram of a process for generating reports for avibration data set, according to some embodiments.

FIG. 10 is a flow diagram of an example process for determining whethera vibration data set for a chiller is normal or abnormal, according tosome embodiments.

FIG. 11 is a flow diagram of a process for labeling vibration data setsas normal or abnormal, according to some embodiments.

DETAILED DESCRIPTION

Overview

Referring generally to the FIGURES, systems and methods for identifyingabnormalities in vibration data sets for building equipment is shown,according to some embodiments. The systems and methods discussed hereincan collect data from building equipment and analyze the collected datato determine whether the building equipment may be in a fault state. Inparticular, the systems and methods described herein can incorporatemachine learning (ML) models that can automatically analyze and identifypossible abnormalities in the vibration data sets.

The ML model can be used to classify vibration data sets as either“normal” or “abnormal.” Normal data sets may indicate associatedbuilding equipment is operating as expected and that no faults may bepresent. However, if the ML model classifies a data set as abnormal, theML model may have determined that the building equipment has apossibility of being in a fault status. As such, any vibration data setstagged by the ML model as abnormal can be provided to an analyst forfurther review. This can ensure that a professional opinion of anindividual trained in analyzing vibration data sets can provide feedbackregarding whether building equipment associated with abnormal data setsis actually in a fault state.

Using the systems and methods described herein, a workload on analystscan be reduced as some data sets can be automatically flagged as normal.In other words, analysts may not be required to analyze every vibrationdata set generated by building equipment. These and other features ofthe systems and methods are described in greater detail below.

Building HVAC Systems and Building Management Systems

Referring now to FIGS. 1-5, several building management systems (BMS)and HVAC systems in which the systems and methods of the presentdisclosure can be implemented are shown, according to some embodiments.In brief overview, FIG. 1 shows a building 10 equipped with a HVACsystem 100. FIG. 2 is a block diagram of a waterside system 200 whichcan be used to serve building 10. FIG. 3 is a block diagram of anairside system 300 which can be used to serve building 10. FIG. 4 is ablock diagram of a BMS which can be used to monitor and control building10. FIG. 5 is a block diagram of another BMS which can be used tomonitor and control building 10.

Building and HVAC System

Referring particularly to FIG. 1, a perspective view of a building 10 isshown. Building 10 is served by a BMS. A BMS is, in general, a system ofdevices configured to control, monitor, and manage equipment in oraround a building or building area. A BMS can include, for example, aHVAC system, a security system, a lighting system, a fire alertingsystem, any other system that is capable of managing building functionsor devices, or any combination thereof.

The BMS that serves building 10 includes a HVAC system 100. HVAC system100 can include a plurality of HVAC devices (e.g., heaters, chillers,air handling units, pumps, fans, thermal energy storage, etc.)configured to provide heating, cooling, ventilation, or other servicesfor building 10. For example, HVAC system 100 is shown to include awaterside system 120 and an airside system 130. Waterside system 120 mayprovide a heated or chilled fluid to an air handling unit of airsidesystem 130. Airside system 130 may use the heated or chilled fluid toheat or cool an airflow provided to building 10. An exemplary watersidesystem and airside system which can be used in HVAC system 100 aredescribed in greater detail with reference to FIGS. 2-3.

HVAC system 100 is shown to include a chiller 102, a boiler 104, and arooftop air handling unit (AHU) 106. Waterside system 120 may use boiler104 and chiller 102 to heat or cool a working fluid (e.g., water,glycol, etc.) and may circulate the working fluid to AHU 106. In variousembodiments, the HVAC devices of waterside system 120 can be located inor around building 10 (as shown in FIG. 1) or at an offsite locationsuch as a central plant (e.g., a chiller plant, a steam plant, a heatplant, etc.). The working fluid can be heated in boiler 104 or cooled inchiller 102, depending on whether heating or cooling is required inbuilding 10. Boiler 104 may add heat to the circulated fluid, forexample, by burning a combustible material (e.g., natural gas) or usingan electric heating element. Chiller 102 may place the circulated fluidin a heat exchange relationship with another fluid (e.g., a refrigerant)in a heat exchanger (e.g., an evaporator) to absorb heat from thecirculated fluid. The working fluid from chiller 102 and/or boiler 104can be transported to AHU 106 via piping 108.

AHU 106 may place the working fluid in a heat exchange relationship withan airflow passing through AHU 106 (e.g., via one or more stages ofcooling coils and/or heating coils). The airflow can be, for example,outside air, return air from within building 10, or a combination ofboth. AHU 106 may transfer heat between the airflow and the workingfluid to provide heating or cooling for the airflow. For example, AHU106 can include one or more fans or blowers configured to pass theairflow over or through a heat exchanger containing the working fluid.The working fluid may then return to chiller 102 or boiler 104 viapiping 110.

Airside system 130 may deliver the airflow supplied by AHU 106 (i.e.,the supply airflow) to building 10 via air supply ducts 112 and mayprovide return air from building 10 to AHU 106 via air return ducts 114.In some embodiments, airside system 130 includes multiple variable airvolume (VAV) units 116. For example, airside system 130 is shown toinclude a separate VAV unit 116 on each floor or zone of building 10.VAV units 116 can include dampers or other flow control elements thatcan be operated to control an amount of the supply airflow provided toindividual zones of building 10. In other embodiments, airside system130 delivers the supply airflow into one or more zones of building 10(e.g., via supply ducts 112) without using intermediate VAV units 116 orother flow control elements. AHU 106 can include various sensors (e.g.,temperature sensors, pressure sensors, etc.) configured to measureattributes of the supply airflow. AHU 106 may receive input from sensorslocated within AHU 106 and/or within the building zone and may adjustthe flow rate, temperature, or other attributes of the supply airflowthrough AHU 106 to achieve setpoint conditions for the building zone.

Waterside System

Referring now to FIG. 2, a block diagram of a waterside system 200 isshown, according to some embodiments. In various embodiments, watersidesystem 200 may supplement or replace waterside system 120 in HVAC system100 or can be implemented separate from HVAC system 100. Whenimplemented in HVAC system 100, waterside system 200 can include asubset of the HVAC devices in HVAC system 100 (e.g., boiler 104, chiller102, pumps, valves, etc.) and may operate to supply a heated or chilledfluid to AHU 106. The HVAC devices of waterside system 200 can belocated within building 10 (e.g., as components of waterside system 120)or at an offsite location such as a central plant.

In FIG. 2, waterside system 200 is shown as a central plant having aplurality of subplants 202-212. Subplants 202-212 are shown to include aheater subplant 202, a heat recovery chiller subplant 204, a chillersubplant 206, a cooling tower subplant 208, a hot thermal energy storage(TES) subplant 210, and a cold thermal energy storage (TES) subplant212. Subplants 202-212 consume resources (e.g., water, natural gas,electricity, etc.) from utilities to serve thermal energy loads (e.g.,hot water, cold water, heating, cooling, etc.) of a building or campus.For example, heater subplant 202 can be configured to heat water in ahot water loop 214 that circulates the hot water between heater subplant202 and building 10. Chiller subplant 206 can be configured to chillwater in a cold water loop 216 that circulates the cold water betweenchiller subplant 206 building 10. Heat recovery chiller subplant 204 canbe configured to transfer heat from cold water loop 216 to hot waterloop 214 to provide additional heating for the hot water and additionalcooling for the cold water. Condenser water loop 218 may absorb heatfrom the cold water in chiller subplant 206 and reject the absorbed heatin cooling tower subplant 208 or transfer the absorbed heat to hot waterloop 214. Hot TES subplant 210 and cold TES subplant 212 may store hotand cold thermal energy, respectively, for subsequent use.

Hot water loop 214 and cold water loop 216 may deliver the heated and/orchilled water to air handlers located on the rooftop of building 10(e.g., AHU 106) or to individual floors or zones of building 10 (e.g.,VAV units 116). The air handlers push air past heat exchangers (e.g.,heating coils or cooling coils) through which the water flows to provideheating or cooling for the air. The heated or cooled air can bedelivered to individual zones of building 10 to serve thermal energyloads of building 10. The water then returns to subplants 202-212 toreceive further heating or cooling.

Although subplants 202-212 are shown and described as heating andcooling water for circulation to a building, it is understood that anyother type of working fluid (e.g., glycol, CO2, etc.) can be used inplace of or in addition to water to serve thermal energy loads. In otherembodiments, subplants 202-212 may provide heating and/or coolingdirectly to the building or campus without requiring an intermediateheat transfer fluid. These and other variations to waterside system 200are within the teachings of the present disclosure.

Each of subplants 202-212 can include a variety of equipment configuredto facilitate the functions of the subplant. For example, heatersubplant 202 is shown to include a plurality of heating elements 220(e.g., boilers, electric heaters, etc.) configured to add heat to thehot water in hot water loop 214. Heater subplant 202 is also shown toinclude several pumps 222 and 224 configured to circulate the hot waterin hot water loop 214 and to control the flow rate of the hot waterthrough individual heating elements 220. Chiller subplant 206 is shownto include a plurality of chillers 232 configured to remove heat fromthe cold water in cold water loop 216. Chiller subplant 206 is alsoshown to include several pumps 234 and 236 configured to circulate thecold water in cold water loop 216 and to control the flow rate of thecold water through individual chillers 232.

Heat recovery chiller subplant 204 is shown to include a plurality ofheat recovery heat exchangers 226 (e.g., refrigeration circuits)configured to transfer heat from cold water loop 216 to hot water loop214. Heat recovery chiller subplant 204 is also shown to include severalpumps 228 and 230 configured to circulate the hot water and/or coldwater through heat recovery heat exchangers 226 and to control the flowrate of the water through individual heat recovery heat exchangers 226.Cooling tower subplant 208 is shown to include a plurality of coolingtowers 238 configured to remove heat from the condenser water incondenser water loop 218. Cooling tower subplant 208 is also shown toinclude several pumps 240 configured to circulate the condenser water incondenser water loop 218 and to control the flow rate of the condenserwater through individual cooling towers 238.

Hot TES subplant 210 is shown to include a hot TES tank 242 configuredto store the hot water for later use. Hot TES subplant 210 may alsoinclude one or more pumps or valves configured to control the flow rateof the hot water into or out of hot TES tank 242. Cold TES subplant 212is shown to include cold TES tanks 244 configured to store the coldwater for later use. Cold TES subplant 212 may also include one or morepumps or valves configured to control the flow rate of the cold waterinto or out of cold TES tanks 244.

In some embodiments, one or more of the pumps in waterside system 200(e.g., pumps 222, 224, 228, 230, 234, 236, and/or 240) or pipelines inwaterside system 200 include an isolation valve associated therewith.Isolation valves can be integrated with the pumps or positioned upstreamor downstream of the pumps to control the fluid flows in watersidesystem 200. In various embodiments, waterside system 200 can includemore, fewer, or different types of devices and/or subplants based on theparticular configuration of waterside system 200 and the types of loadsserved by waterside system 200.

Airside System

Referring now to FIG. 3, a block diagram of an airside system 300 isshown, according to some embodiments. In various embodiments, airsidesystem 300 may supplement or replace airside system 130 in HVAC system100 or can be implemented separate from HVAC system 100. Whenimplemented in HVAC system 100, airside system 300 can include a subsetof the HVAC devices in HVAC system 100 (e.g., AHU 106, VAV units 116,ducts 112-114, fans, dampers, etc.) and can be located in or aroundbuilding 10. Airside system 300 may operate to heat or cool an airflowprovided to building 10 using a heated or chilled fluid provided bywaterside system 200.

In FIG. 3, airside system 300 is shown to include an economizer-type airhandling unit (AHU) 302. Economizer-type AHUs vary the amount of outsideair and return air used by the air handling unit for heating or cooling.For example, AHU 302 may receive return air 304 from building zone 306via return air duct 308 and may deliver supply air 310 to building zone306 via supply air duct 312. In some embodiments, AHU 302 is a rooftopunit located on the roof of building 10 (e.g., AHU 106 as shown inFIG. 1) or otherwise positioned to receive both return air 304 andoutside air 314. AHU 302 can be configured to operate exhaust air damper316, mixing damper 318, and outside air damper 320 to control an amountof outside air 314 and return air 304 that combine to form supply air310. Any return air 304 that does not pass through mixing damper 318 canbe exhausted from AHU 302 through exhaust damper 316 as exhaust air 322.

Each of dampers 316-320 can be operated by an actuator. For example,exhaust air damper 316 can be operated by actuator 324, mixing damper318 can be operated by actuator 326, and outside air damper 320 can beoperated by actuator 328. Actuators 324-328 may communicate with an AHUcontroller 330 via a communications link 332. Actuators 324-328 mayreceive control signals from AHU controller 330 and may provide feedbacksignals to AHU controller 330. Feedback signals can include, forexample, an indication of a current actuator or damper position, anamount of torque or force exerted by the actuator, diagnosticinformation (e.g., results of diagnostic tests performed by actuators324-328), status information, commissioning information, configurationsettings, calibration data, and/or other types of information or datathat can be collected, stored, or used by actuators 324-328. AHUcontroller 330 can be an economizer controller configured to use one ormore control algorithms (e.g., state-based algorithms, extremum seekingcontrol (ESC) algorithms, proportional-integral (PI) control algorithms,proportional-integral-derivative (PID) control algorithms, modelpredictive control (MPC) algorithms, feedback control algorithms, etc.)to control actuators 324-328.

Still referring to FIG. 3, AHU 302 is shown to include a cooling coil334, a heating coil 336, and a fan 338 positioned within supply air duct312. Fan 338 can be configured to force supply air 310 through coolingcoil 334 and/or heating coil 336 and provide supply air 310 to buildingzone 306. AHU controller 330 may communicate with fan 338 viacommunications link 340 to control a flow rate of supply air 310. Insome embodiments, AHU controller 330 controls an amount of heating orcooling applied to supply air 310 by modulating a speed of fan 338.

Cooling coil 334 may receive a chilled fluid from waterside system 200(e.g., from cold water loop 216) via piping 342 and may return thechilled fluid to waterside system 200 via piping 344. Valve 346 can bepositioned along piping 342 or piping 344 to control a flow rate of thechilled fluid through cooling coil 334. In some embodiments, coolingcoil 334 includes multiple stages of cooling coils that can beindependently activated and deactivated (e.g., by AHU controller 330, byBMS controller 366, etc.) to modulate an amount of cooling applied tosupply air 310.

Heating coil 336 may receive a heated fluid from waterside system 200(e.g., from hot water loop 214) via piping 348 and may return the heatedfluid to waterside system 200 via piping 350. Valve 352 can bepositioned along piping 348 or piping 350 to control a flow rate of theheated fluid through heating coil 336. In some embodiments, heating coil336 includes multiple stages of heating coils that can be independentlyactivated and deactivated (e.g., by AHU controller 330, by BMScontroller 366, etc.) to modulate an amount of heating applied to supplyair 310.

Each of valves 346 and 352 can be controlled by an actuator. Forexample, valve 346 can be controlled by actuator 354 and valve 352 canbe controlled by actuator 356. Actuators 354-356 may communicate withAHU controller 330 via communications links 358-360. Actuators 354-356may receive control signals from AHU controller 330 and may providefeedback signals to controller 330. In some embodiments, AHU controller330 receives a measurement of the supply air temperature from atemperature sensor 362 positioned in supply air duct 312 (e.g.,downstream of cooling coil 334 and/or heating coil 336). AHU controller330 may also receive a measurement of the temperature of building zone306 from a temperature sensor 364 located in building zone 306.

In some embodiments, AHU controller 330 operates valves 346 and 352 viaactuators 354-356 to modulate an amount of heating or cooling providedto supply air 310 (e.g., to achieve a setpoint temperature for supplyair 310 or to maintain the temperature of supply air 310 within asetpoint temperature range). The positions of valves 346 and 352 affectthe amount of heating or cooling provided to supply air 310 by coolingcoil 334 or heating coil 336 and may correlate with the amount of energyconsumed to achieve a desired supply air temperature. AHU 330 maycontrol the temperature of supply air 310 and/or building zone 306 byactivating or deactivating coils 334-336, adjusting a speed of fan 338,or a combination of both.

Still referring to FIG. 3, airside system 300 is shown to include abuilding management system (BMS) controller 366 and a client device 368.BMS controller 366 can include one or more computer systems (e.g.,servers, supervisory controllers, subsystem controllers, etc.) thatserve as system level controllers, application or data servers, headnodes, or master controllers for airside system 300, waterside system200, HVAC system 100, and/or other controllable systems that servebuilding 10. BMS controller 366 may communicate with multiple downstreambuilding systems or subsystems (e.g., HVAC system 100, a securitysystem, a lighting system, waterside system 200, etc.) via acommunications link 370 according to like or disparate protocols (e.g.,LON, BACnet, etc.). In various embodiments, AHU controller 330 and BMScontroller 366 can be separate (as shown in FIG. 3) or integrated. In anintegrated implementation, AHU controller 330 can be a software moduleconfigured for execution by a processor of BMS controller 366.

In some embodiments, AHU controller 330 receives information from BMScontroller 366 (e.g., commands, setpoints, operating boundaries, etc.)and provides information to BMS controller 366 (e.g., temperaturemeasurements, valve or actuator positions, operating statuses,diagnostics, etc.). For example, AHU controller 330 may provide BMScontroller 366 with temperature measurements from temperature sensors362-364, equipment on/off states, equipment operating capacities, and/orany other information that can be used by BMS controller 366 to monitoror control a variable state or condition within building zone 306.

Client device 368 can include one or more human-machine interfaces orclient interfaces (e.g., graphical user interfaces, reportinginterfaces, text-based computer interfaces, client-facing web services,web servers that provide pages to web clients, etc.) for controlling,viewing, or otherwise interacting with HVAC system 100, its subsystems,and/or devices. Client device 368 can be a computer workstation, aclient terminal, a remote or local interface, or any other type of userinterface device. Client device 368 can be a stationary terminal or amobile device. For example, client device 368 can be a desktop computer,a computer server with a user interface, a laptop computer, a tablet, asmartphone, a PDA, or any other type of mobile or non-mobile device.Client device 368 may communicate with BMS controller 366 and/or AHUcontroller 330 via communications link 372.

Building Management Systems

Referring now to FIG. 4, a block diagram of a building management system(BMS) 400 is shown, according to some embodiments. BMS 400 can beimplemented in building 10 to automatically monitor and control variousbuilding functions. BMS 400 is shown to include BMS controller 366 and aplurality of building subsystems 428. Building subsystems 428 are shownto include a building electrical subsystem 434, an informationcommunication technology (ICT) subsystem 436, a security subsystem 438,a HVAC subsystem 440, a lighting subsystem 442, a lift/escalatorssubsystem 432, and a fire safety subsystem 430. In various embodiments,building subsystems 428 can include fewer, additional, or alternativesubsystems. For example, building subsystems 428 may also oralternatively include a refrigeration subsystem, an advertising orsignage subsystem, a cooking subsystem, a vending subsystem, a printeror copy service subsystem, or any other type of building subsystem thatuses controllable equipment and/or sensors to monitor or controlbuilding 10. In some embodiments, building subsystems 428 includewaterside system 200 and/or airside system 300, as described withreference to FIGS. 2-3.

Each of building subsystems 428 can include any number of devices,controllers, and connections for completing its individual functions andcontrol activities. HVAC subsystem 440 can include many of the samecomponents as HVAC system 100, as described with reference to FIGS. 1-3.For example, HVAC subsystem 440 can include a chiller, a boiler, anynumber of air handling units, economizers, field controllers,supervisory controllers, actuators, temperature sensors, and otherdevices for controlling the temperature, humidity, airflow, or othervariable conditions within building 10. Lighting subsystem 442 caninclude any number of light fixtures, ballasts, lighting sensors,dimmers, or other devices configured to controllably adjust the amountof light provided to a building space. Security subsystem 438 caninclude occupancy sensors, video surveillance cameras, digital videorecorders, video processing servers, intrusion detection devices, accesscontrol devices and servers, or other security-related devices.

Still referring to FIG. 4, BMS controller 366 is shown to include acommunications interface 407 and a BMS interface 409. Interface 407 mayfacilitate communications between BMS controller 366 and externalapplications (e.g., monitoring and reporting applications 422,enterprise control applications 426, remote systems and applications444, applications residing on client devices 448, etc.) for allowinguser control, monitoring, and adjustment to BMS controller 366 and/orsubsystems 428. Interface 407 may also facilitate communications betweenBMS controller 366 and client devices 448. BMS interface 409 mayfacilitate communications between BMS controller 366 and buildingsubsystems 428 (e.g., HVAC, lighting security, lifts, powerdistribution, business, etc.).

Interfaces 407, 409 can be or include wired or wireless communicationsinterfaces (e.g., jacks, antennas, transmitters, receivers,transceivers, wire terminals, etc.) for conducting data communicationswith building subsystems 428 or other external systems or devices. Invarious embodiments, communications via interfaces 407, 409 can bedirect (e.g., local wired or wireless communications) or via acommunications network 446 (e.g., a WAN, the Internet, a cellularnetwork, etc.). For example, interfaces 407, 409 can include an Ethernetcard and port for sending and receiving data via an Ethernet-basedcommunications link or network. In another example, interfaces 407, 409can include a Wi-Fi transceiver for communicating via a wirelesscommunications network. In another example, one or both of interfaces407, 409 can include cellular or mobile phone communicationstransceivers. In one embodiment, communications interface 407 is a powerline communications interface and BMS interface 409 is an Ethernetinterface. In other embodiments, both communications interface 407 andBMS interface 409 are Ethernet interfaces or are the same Ethernetinterface.

Still referring to FIG. 4, BMS controller 366 is shown to include aprocessing circuit 404 including a processor 406 and memory 408.Processing circuit 404 can be communicably connected to BMS interface409 and/or communications interface 407 such that processing circuit 404and the various components thereof can send and receive data viainterfaces 407, 409. Processor 406 can be implemented as a generalpurpose processor, an application specific integrated circuit (ASIC),one or more field programmable gate arrays (FPGAs), a group ofprocessing components, or other suitable electronic processingcomponents.

Memory 408 (e.g., memory, memory unit, storage device, etc.) can includeone or more devices (e.g., RAM, ROM, Flash memory, hard disk storage,etc.) for storing data and/or computer code for completing orfacilitating the various processes, layers and modules described in thepresent application. Memory 408 can be or include volatile memory ornon-volatile memory. Memory 408 can include database components, objectcode components, script components, or any other type of informationstructure for supporting the various activities and informationstructures described in the present application. According to someembodiments, memory 408 is communicably connected to processor 406 viaprocessing circuit 404 and includes computer code for executing (e.g.,by processing circuit 404 and/or processor 406) one or more processesdescribed herein.

In some embodiments, BMS controller 366 is implemented within a singlecomputer (e.g., one server, one housing, etc.). In various otherembodiments BMS controller 366 can be distributed across multipleservers or computers (e.g., that can exist in distributed locations).Further, while FIG. 4 shows applications 422 and 426 as existing outsideof BMS controller 366, in some embodiments, applications 422 and 426 canbe hosted within BMS controller 366 (e.g., within memory 408).

Still referring to FIG. 4, memory 408 is shown to include an enterpriseintegration layer 410, an automated measurement and validation (AM&V)layer 412, a demand response (DR) layer 414, a fault detection anddiagnostics (FDD) layer 416, an integrated control layer 418, and abuilding subsystem integration later 420. Layers 410-420 can beconfigured to receive inputs from building subsystems 428 and other datasources, determine optimal control actions for building subsystems 428based on the inputs, generate control signals based on the optimalcontrol actions, and provide the generated control signals to buildingsubsystems 428. The following paragraphs describe some of the generalfunctions performed by each of layers 410-420 in BMS 400.

Enterprise integration layer 410 can be configured to serve clients orlocal applications with information and services to support a variety ofenterprise-level applications. For example, enterprise controlapplications 426 can be configured to provide subsystem-spanning controlto a graphical user interface (GUI) or to any number of enterprise-levelbusiness applications (e.g., accounting systems, user identificationsystems, etc.). Enterprise control applications 426 may also oralternatively be configured to provide configuration GUIs forconfiguring BMS controller 366. In yet other embodiments, enterprisecontrol applications 426 can work with layers 410-420 to optimizebuilding performance (e.g., efficiency, energy use, comfort, or safety)based on inputs received at interface 407 and/or BMS interface 409.

Building subsystem integration layer 420 can be configured to managecommunications between BMS controller 366 and building subsystems 428.For example, building subsystem integration layer 420 may receive sensordata and input signals from building subsystems 428 and provide outputdata and control signals to building subsystems 428. Building subsystemintegration layer 420 may also be configured to manage communicationsbetween building subsystems 428. Building subsystem integration layer420 translate communications (e.g., sensor data, input signals, outputsignals, etc.) across a plurality of multi-vendor/multi-protocolsystems.

Demand response layer 414 can be configured to optimize resource usage(e.g., electricity use, natural gas use, water use, etc.) and/or themonetary cost of such resource usage in response to satisfy the demandof building 10. The optimization can be based on time-of-use prices,curtailment signals, energy availability, or other data received fromutility providers, distributed energy generation systems 424, fromenergy storage 427 (e.g., hot TES 242, cold TES 244, etc.), or fromother sources. Demand response layer 414 may receive inputs from otherlayers of BMS controller 366 (e.g., building subsystem integration layer420, integrated control layer 418, etc.). The inputs received from otherlayers can include environmental or sensor inputs such as temperature,carbon dioxide levels, relative humidity levels, air quality sensoroutputs, occupancy sensor outputs, room schedules, and the like. Theinputs may also include inputs such as electrical use (e.g., expressedin kWh), thermal load measurements, pricing information, projectedpricing, smoothed pricing, curtailment signals from utilities, and thelike.

According to some embodiments, demand response layer 414 includescontrol logic for responding to the data and signals it receives. Theseresponses can include communicating with the control algorithms inintegrated control layer 418, changing control strategies, changingsetpoints, or activating/deactivating building equipment or subsystemsin a controlled manner. Demand response layer 414 may also includecontrol logic configured to determine when to utilize stored energy. Forexample, demand response layer 414 may determine to begin using energyfrom energy storage 427 just prior to the beginning of a peak use hour.

In some embodiments, demand response layer 414 includes a control moduleconfigured to actively initiate control actions (e.g., automaticallychanging setpoints) which minimize energy costs based on one or moreinputs representative of or based on demand (e.g., price, a curtailmentsignal, a demand level, etc.). In some embodiments, demand responselayer 414 uses equipment models to determine an optimal set of controlactions. The equipment models can include, for example, thermodynamicmodels describing the inputs, outputs, and/or functions performed byvarious sets of building equipment. Equipment models may representcollections of building equipment (e.g., subplants, chiller arrays,etc.) or individual devices (e.g., individual chillers, heaters, pumps,etc.).

Demand response layer 414 may further include or draw upon one or moredemand response policy definitions (e.g., databases, XML files, etc.).The policy definitions can be edited or adjusted by a user (e.g., via agraphical user interface) so that the control actions initiated inresponse to demand inputs can be tailored for the user's application,desired comfort level, particular building equipment, or based on otherconcerns. For example, the demand response policy definitions canspecify which equipment can be turned on or off in response toparticular demand inputs, how long a system or piece of equipment shouldbe turned off, what setpoints can be changed, what the allowable setpoint adjustment range is, how long to hold a high demand setpointbefore returning to a normally scheduled setpoint, how close to approachcapacity limits, which equipment modes to utilize, the energy transferrates (e.g., the maximum rate, an alarm rate, other rate boundaryinformation, etc.) into and out of energy storage devices (e.g., thermalstorage tanks, battery banks, etc.), and when to dispatch on-sitegeneration of energy (e.g., via fuel cells, a motor generator set,etc.).

Integrated control layer 418 can be configured to use the data input oroutput of building subsystem integration layer 420 and/or demandresponse later 414 to make control decisions. Due to the subsystemintegration provided by building subsystem integration layer 420,integrated control layer 418 can integrate control activities of thesubsystems 428 such that the subsystems 428 behave as a singleintegrated supersystem. In some embodiments, integrated control layer418 includes control logic that uses inputs and outputs from a pluralityof building subsystems to provide greater comfort and energy savingsrelative to the comfort and energy savings that separate subsystemscould provide alone. For example, integrated control layer 418 can beconfigured to use an input from a first subsystem to make anenergy-saving control decision for a second subsystem. Results of thesedecisions can be communicated back to building subsystem integrationlayer 420.

Integrated control layer 418 is shown to be logically below demandresponse layer 414. Integrated control layer 418 can be configured toenhance the effectiveness of demand response layer 414 by enablingbuilding subsystems 428 and their respective control loops to becontrolled in coordination with demand response layer 414. Thisconfiguration may advantageously reduce disruptive demand responsebehavior relative to conventional systems. For example, integratedcontrol layer 418 can be configured to assure that a demandresponse-driven upward adjustment to the setpoint for chilled watertemperature (or another component that directly or indirectly affectstemperature) does not result in an increase in fan energy (or otherenergy used to cool a space) that would result in greater total buildingenergy use than was saved at the chiller.

Integrated control layer 418 can be configured to provide feedback todemand response layer 414 so that demand response layer 414 checks thatconstraints (e.g., temperature, lighting levels, etc.) are properlymaintained even while demanded load shedding is in progress. Theconstraints may also include setpoint or sensed boundaries relating tosafety, equipment operating limits and performance, comfort, fire codes,electrical codes, energy codes, and the like. Integrated control layer418 is also logically below fault detection and diagnostics layer 416and automated measurement and validation layer 412. Integrated controllayer 418 can be configured to provide calculated inputs (e.g.,aggregations) to these higher levels based on outputs from more than onebuilding subsystem.

Automated measurement and validation (AM&V) layer 412 can be configuredto verify that control strategies commanded by integrated control layer418 or demand response layer 414 are working properly (e.g., using dataaggregated by AM&V layer 412, integrated control layer 418, buildingsubsystem integration layer 420, FDD layer 416, or otherwise). Thecalculations made by AM&V layer 412 can be based on building systemenergy models and/or equipment models for individual BMS devices orsubsystems. For example, AM&V layer 412 may compare a model-predictedoutput with an actual output from building subsystems 428 to determinean accuracy of the model.

Fault detection and diagnostics (FDD) layer 416 can be configured toprovide on-going fault detection for building subsystems 428, buildingsubsystem devices (i.e., building equipment), and control algorithmsused by demand response layer 414 and integrated control layer 418. FDDlayer 416 may receive data inputs from integrated control layer 418,directly from one or more building subsystems or devices, or fromanother data source. FDD layer 416 may automatically diagnose andrespond to detected faults. The responses to detected or diagnosedfaults can include providing an alert message to a user, a maintenancescheduling system, or a control algorithm configured to attempt torepair the fault or to work-around the fault.

FDD layer 416 can be configured to output a specific identification ofthe faulty component or cause of the fault (e.g., loose damper linkage)using detailed subsystem inputs available at building subsystemintegration layer 420. In other exemplary embodiments, FDD layer 416 isconfigured to provide “fault” events to integrated control layer 418which executes control strategies and policies in response to thereceived fault events. According to some embodiments, FDD layer 416 (ora policy executed by an integrated control engine or business rulesengine) may shut-down systems or direct control activities around faultydevices or systems to reduce energy waste, extend equipment life, orassure proper control response.

FDD layer 416 can be configured to store or access a variety ofdifferent system data stores (or data points for live data). FDD layer416 may use some content of the data stores to identify faults at theequipment level (e.g., specific chiller, specific AHU, specific terminalunit, etc.) and other content to identify faults at component orsubsystem levels. For example, building subsystems 428 may generatetemporal (i.e., time-series) data indicating the performance of BMS 400and the various components thereof. The data generated by buildingsubsystems 428 can include measured or calculated values that exhibitstatistical characteristics and provide information about how thecorresponding system or process (e.g., a temperature control process, aflow control process, etc.) is performing in terms of error from itssetpoint. These processes can be examined by FDD layer 416 to exposewhen the system begins to degrade in performance and alert a user torepair the fault before it becomes more severe.

Referring now to FIG. 5, a block diagram of another building managementsystem (BMS) 500 is shown, according to some embodiments. BMS 500 can beused to monitor and control the devices of HVAC system 100, watersidesystem 200, airside system 300, building subsystems 428, as well asother types of BMS devices (e.g., lighting equipment, securityequipment, etc.) and/or HVAC equipment.

BMS 500 provides a system architecture that facilitates automaticequipment discovery and equipment model distribution. Equipmentdiscovery can occur on multiple levels of BMS 500 across multipledifferent communications busses (e.g., a system bus 554, zone buses556-560 and 564, sensor/actuator bus 566, etc.) and across multipledifferent communications protocols. In some embodiments, equipmentdiscovery is accomplished using active node tables, which provide statusinformation for devices connected to each communications bus. Forexample, each communications bus can be monitored for new devices bymonitoring the corresponding active node table for new nodes. When a newdevice is detected, BMS 500 can begin interacting with the new device(e.g., sending control signals, using data from the device) without userinteraction.

Some devices in BMS 500 present themselves to the network usingequipment models. An equipment model defines equipment objectattributes, view definitions, schedules, trends, and the associatedBACnet value objects (e.g., analog value, binary value, multistatevalue, etc.) that are used for integration with other systems. Somedevices in BMS 500 store their own equipment models. Other devices inBMS 500 have equipment models stored externally (e.g., within otherdevices). For example, a zone coordinator 508 can store the equipmentmodel for a bypass damper 528. In some embodiments, zone coordinator 508automatically creates the equipment model for bypass damper 528 or otherdevices on zone bus 558. Other zone coordinators can also createequipment models for devices connected to their zone busses. Theequipment model for a device can be created automatically based on thetypes of data points exposed by the device on the zone bus, device type,and/or other device attributes. Several examples of automatic equipmentdiscovery and equipment model distribution are discussed in greaterdetail below.

Still referring to FIG. 5, BMS 500 is shown to include a system manager502; several zone coordinators 506, 508, 510 and 518; and several zonecontrollers 524, 530, 532, 536, 548, and 550. System manager 502 canmonitor data points in BMS 500 and report monitored variables to variousmonitoring and/or control applications. System manager 502 cancommunicate with client devices 504 (e.g., user devices, desktopcomputers, laptop computers, mobile devices, etc.) via a datacommunications link 574 (e.g., BACnet IP, Ethernet, wired or wirelesscommunications, etc.). System manager 502 can provide a user interfaceto client devices 504 via data communications link 574. The userinterface may allow users to monitor and/or control BMS 500 via clientdevices 504.

In some embodiments, system manager 502 is connected with zonecoordinators 506-510 and 518 via a system bus 554. System manager 502can be configured to communicate with zone coordinators 506-510 and 518via system bus 554 using a master-slave token passing (MSTP) protocol orany other communications protocol. System bus 554 can also connectsystem manager 502 with other devices such as a constant volume (CV)rooftop unit (RTU) 512, an input/output module (TOM) 514, a thermostatcontroller 516 (e.g., a TEC5000 series thermostat controller), and anetwork automation engine (NAE) or third-party controller 520. RTU 512can be configured to communicate directly with system manager 502 andcan be connected directly to system bus 554. Other RTUs can communicatewith system manager 502 via an intermediate device. For example, a wiredinput 562 can connect a third-party RTU 542 to thermostat controller516, which connects to system bus 554.

System manager 502 can provide a user interface for any devicecontaining an equipment model. Devices such as zone coordinators 506-510and 518 and thermostat controller 516 can provide their equipment modelsto system manager 502 via system bus 554. In some embodiments, systemmanager 502 automatically creates equipment models for connected devicesthat do not contain an equipment model (e.g., IOM 514, third partycontroller 520, etc.). For example, system manager 502 can create anequipment model for any device that responds to a device tree request.The equipment models created by system manager 502 can be stored withinsystem manager 502. System manager 502 can then provide a user interfacefor devices that do not contain their own equipment models using theequipment models created by system manager 502. In some embodiments,system manager 502 stores a view definition for each type of equipmentconnected via system bus 554 and uses the stored view definition togenerate a user interface for the equipment.

Each zone coordinator 506-510 and 518 can be connected with one or moreof zone controllers 524, 530-532, 536, and 548-550 via zone buses 556,558, 560, and 564. Zone coordinators 506-510 and 518 can communicatewith zone controllers 524, 530-532, 536, and 548-550 via zone busses556-560 and 564 using a MSTP protocol or any other communicationsprotocol. Zone busses 556-560 and 564 can also connect zone coordinators506-510 and 518 with other types of devices such as variable air volume(VAV) RTUs 522 and 540, changeover bypass (COBP) RTUs 526 and 552,bypass dampers 528 and 546, and PEAK controllers 534 and 544.

Zone coordinators 506-510 and 518 can be configured to monitor andcommand various zoning systems. In some embodiments, each zonecoordinator 506-510 and 518 monitors and commands a separate zoningsystem and is connected to the zoning system via a separate zone bus.For example, zone coordinator 506 can be connected to VAV RTU 522 andzone controller 524 via zone bus 556. Zone coordinator 508 can beconnected to COBP RTU 526, bypass damper 528, COBP zone controller 530,and VAV zone controller 532 via zone bus 558. Zone coordinator 510 canbe connected to PEAK controller 534 and VAV zone controller 536 via zonebus 560. Zone coordinator 518 can be connected to PEAK controller 544,bypass damper 546, COBP zone controller 548, and VAV zone controller 550via zone bus 564.

A single model of zone coordinator 506-510 and 518 can be configured tohandle multiple different types of zoning systems (e.g., a VAV zoningsystem, a COBP zoning system, etc.). Each zoning system can include aRTU, one or more zone controllers, and/or a bypass damper. For example,zone coordinators 506 and 510 are shown as Verasys VAV engines (VVEs)connected to VAV RTUs 522 and 540, respectively. Zone coordinator 506 isconnected directly to VAV RTU 522 via zone bus 556, whereas zonecoordinator 510 is connected to a third-party VAV RTU 540 via a wiredinput 568 provided to PEAK controller 534. Zone coordinators 508 and 518are shown as Verasys COBP engines (VCEs) connected to COBP RTUs 526 and552, respectively. Zone coordinator 508 is connected directly to COBPRTU 526 via zone bus 558, whereas zone coordinator 518 is connected to athird-party COBP RTU 552 via a wired input 570 provided to PEAKcontroller 544.

Zone controllers 524, 530-532, 536, and 548-550 can communicate withindividual BMS devices (e.g., sensors, actuators, etc.) viasensor/actuator (SA) busses. For example, VAV zone controller 536 isshown connected to networked sensors 538 via SA bus 566. Zone controller536 can communicate with networked sensors 538 using a MSTP protocol orany other communications protocol. Although only one SA bus 566 is shownin FIG. 5, it should be understood that each zone controller 524,530-532, 536, and 548-550 can be connected to a different SA bus. EachSA bus can connect a zone controller with various sensors (e.g.,temperature sensors, humidity sensors, pressure sensors, light sensors,occupancy sensors, etc.), actuators (e.g., damper actuators, valveactuators, etc.) and/or other types of controllable equipment (e.g.,chillers, heaters, fans, pumps, etc.).

Each zone controller 524, 530-532, 536, and 548-550 can be configured tomonitor and control a different building zone. Zone controllers 524,530-532, 536, and 548-550 can use the inputs and outputs provided viatheir SA busses to monitor and control various building zones. Forexample, a zone controller 536 can use a temperature input received fromnetworked sensors 538 via SA bus 566 (e.g., a measured temperature of abuilding zone) as feedback in a temperature control algorithm. Zonecontrollers 524, 530-532, 536, and 548-550 can use various types ofcontrol algorithms (e.g., state-based algorithms, extremum seekingcontrol (ESC) algorithms, proportional-integral (PI) control algorithms,proportional-integral-derivative (PID) control algorithms, modelpredictive control (MPC) algorithms, feedback control algorithms, etc.)to control a variable state or condition (e.g., temperature, humidity,airflow, lighting, etc.) in or around building 10.

Chiller Assembly

Turning now to FIG. 6, an example implementation of a chiller assembly600 is shown, according to some embodiments. Chiller assembly 600 may beidentical or nearly identical to chiller 102 described above. Chillerassembly 600 is shown to include a compressor 602 driven by a motor 604,a condenser 606, and an evaporator 608. A refrigerant can be circulatedthrough chiller assembly 600 in a vapor compression cycle or anabsorption refrigeration cycle. The refrigerant can be a low pressurerefrigerant with an operating pressure less than 400 kPa, for example.Chiller assembly 600 can also include a control panel 614 configured tocontrol operation of the vapor compression cycle within chiller assembly600. Control panel 614 may be connected to a variety of sensors (e.g.,pressure sensors, temperature sensors) and an electronic network (e.g.,network 446) in order to communicate a variety of data related tomaintenance, analytics, performance, etc. The sensors may additionallyor alternatively communicate directly with a controller (e.g., BMScontroller 366) and/or BMS 400.

Motor 604 can be powered by a variable speed drive (VSD) 610. In someembodiments, VSD 610 receives alternating current (AC) power having afixed line voltage and fixed line frequency from an AC power source (notshown) and provides power having a variable voltage and frequency tomotor 604. Motor 604 can be any type of electric motor that can bepowered by VSD 610

For example, motor 604 can be a high speed induction motor. Compressor602 can be driven by motor 604 to compress a refrigerant vapor receivedfrom evaporator 608 through a suction line 612. For example, compressor602 can include an impeller comprising a plurality of blades configuredto rotate at a high speed in order to compress refrigerant vapor.Compressor 602 may then delivers compressed refrigerant vapor tocondenser 606 through a discharge line. Compressor 602 can be acentrifugal compressor, a screw compressor, a scroll compressor, aturbine compressor, or any other type of suitable compressor.

Evaporator 608 can include an internal tube bundle (not shown), a supplyline 620, and a return line 622 for supplying and removing a processfluid to the internal tube bundle. Supply line 620 and return line 622can be in fluid communication with a component within an HVAC system(e.g., air handler 106) via conduits that circulate the process fluid.In some embodiments, the process fluid is a chilled liquid for cooling abuilding and can be, but is not limited to, water, ethylene glycol,calcium chloride brine, sodium chloride brine, or any other suitableliquid. Evaporator 608 can be configured to lower the temperature of theprocess fluid as the process fluid passes through the tube bundle ofevaporator 608 and exchanges heat with the refrigerant. Refrigerantvapor is formed in evaporator 608 by the refrigerant liquid delivered tothe evaporator 608 exchanging heat with the process fluid and undergoinga phase change to refrigerant vapor.

Refrigerant vapor delivered by compressor 602 to condenser 606 transfersheat to a fluid. Refrigerant vapor condenses to refrigerant liquid incondenser 606 as a result of heat transfer with the fluid. Therefrigerant liquid from condenser 606 can flow through an expansiondevice and be returned to evaporator 608 to complete the refrigerantcycle of the chiller assembly 600. Condenser 606 includes a supply line616 and a return line 618 for circulating fluid between the condenser606 and an external component of the HVAC system (e.g., a coolingtower). Fluid supplied to condenser 606 via return line 618 can exchangeheat with the refrigerant in condenser 606 and can be removed from thecondenser 606 via supply line 616 to complete the cycle. The fluidcirculating through the condenser 606 can be water or any other suitableliquid.

In some embodiments, chiller assembly 600 illustrates an examplebuilding device that can be monitored for vibrational data. Sensors canbe mounted to an external casing of chiller assembly 600. Specifically,sensors may be mounted at bearing locations across a drive line ofchiller assembly 600. In this case, the bearing locations may belocations of chiller assembly 600 that experience transfer of forces tothe external casing of chiller assembly 600. Sensors can be mounted tomeasure three-dimensional vibrational data of chiller assembly 600. Inother words, the sensors can measure how chiller assembly 600 and/orassociated components vibrate in three-dimensional space. Purely forsake of example, sensors for measuring vibrational data may be mountedat locations of chiller assembly 600 such as motor 604, VSD 610,compressor 602, suction line 612, etc. In this way, vibrational data canbe collected across various locations of chiller assembly 600.Vibrational data and processing associated therewith is described ingreater detail below with reference to FIGS. 7-11.

Building Management Systems

Referring generally to FIGS. 7-11, systems and methods for analyzingdata sets and identifying faulty building equipment using machinelearning are shown, according to some embodiments. Specifically, FIGS.7-11 may relate to analyzing vibration data sets for building equipmentthat can provide an overall indication of whether specific buildingdevices are functioning properly. However, it should be appreciated thatsimilar methodologies described herein can be applied to data sets otherthan vibration data sets. As such, vibration data sets are provided forpurposes of example and are not intended to be limiting on the presentdisclosure. Other types of data sets are contemplated in the presentdisclosure as well. Further, it should be appreciated that analyzingvibration data sets for building equipment as described herein isprovided for sake of example. Analyzation of vibration data sets asdescribed herein can be applied to any sort of equipment and is notintended to be limited to building equipment. For example, vibrationdata sets can be gathered and analyzed for equipment such asphotolithography equipment, microelectronics manufacturing equipment orother manufacturing equipment, etc. In this way, vibration data sets canbe analyzed to detect faults and/or other problems in various types ofequipment.

Vibration analysis is an important tool in identifying mechanical issuesin building equipment such as chillers, fans, pumps, etc. In someembodiments vibrational data is collected on-site by mounting sensors onbuilding equipment. For example, sensors may be placed on a casing of amachine at bearing locations across a machine drive line. Vibrationalsensors may be placed at bearings as bearings may be a primary pointwhere forces are transferred from internal components to an externalcasing. Sensors may be placed across multiple bearing points (e.g., 3points, 4 points, 10 points, etc.) on a building device and canmonitor/gather vibrational data across 3-dimensional spatial coordinates(i.e., X axis, Y axis, and Z axis). The vibrational data can be assessedto identify potential issues so they can be corrected before seriousdamage to the building equipment occurs. While rules derived from yearsof domain knowledge may automate a portion of the analysis, said rulesare incomplete and cannot confidently rule out a possibility of buildingfaults, and therefore human inspection of all datasets may be requiredin traditional systems.

Due to modern advances in building equipment, most building equipment ishighly reliable and experiences faults relatively infrequently. As such,a large amount of vibration data sets associated with building equipmentmay indicate the building equipment is operating as normal. Requiringanalysts to manually parse through data sets that have no suspicion ofindicating faults can be time-consuming and wasteful for the analystsand a company hiring said analysts. As such, a machine learning modelcan be utilized to qualify data sets into categories indicating whetherthe data sets appear to indicate normal operation or appear to indicatean issue with building equipment that should be addressed in furtherdetail.

As a size of collected vibration data sets increases, human analysis ofeach data set may become more and more unviable. As such, a machinelearning (ML) model can be utilized to reduce an amount of data setsrequired for human analysis. By automating at least part of the analysisprocess, a burden on analysts can be reduced and money can be saved fora company (e.g., by requiring fewer analysts) among other benefits.

When analyzing data sets for building equipment, it may be important forthe ML model to generate reports (i.e., results of automated analyses)that do not let any data set be flagged as “normal” (i.e., no issue ispresent) when the data set is actually “abnormal” (i.e., a problem withthe building equipment is present). In other words, anomaly detectionperformed by the ML model may be configured such that any data sets thathave even a slight change of being abnormal may be flagged for furtheranalysis by an analyst. In this way, a number of false negatives can bereduced/eliminated to ensure that no critical faults are missed by theML model and are accidentally flagged as normal.

Referring now to FIG. 7, a block diagram of data set abnormalitycontroller 700 is shown, according to some embodiments. Data setabnormality controller 700 can be configured to analyze vibration datasets (or other types of data sets) to determine if the data sets includeabnormalities that may be indicative of problems with building equipment(e.g., building equipment 720). In particular, data set abnormalitycontroller 700 can utilize ML models to qualify data sets as eithernormal or abnormal such that abnormal data sets can be further analyzedby an analyst.

As described in greater detail below, data set abnormality controller700 can provide various benefits for a building system and employeesassociated therewith. In particular, by implementing the ML models forqualifying data sets, an efficiency of analysts that analyze vibrationaldata can be increased and a number of data sets the analysts arerequired to evaluate can decrease.

Data set abnormality controller 700 is shown to include a communicationsinterface 708 and a processing circuit 702. Communications interface 708may include wired or wireless interfaces (e.g., jacks, antennas,transmitters, receivers, transceivers, wire terminals, etc.) forconducting data communications with various systems, devices, ornetworks. For example, communications interface 708 may include anEthernet card and port for sending and receiving data via anEthernet-based communications network and/or a Wi-Fi transceiver forcommunicating via a wireless communications network. Communicationsinterface 708 may be configured to communicate via local area networksor wide area networks (e.g., the Internet, a building WAN, etc.) and mayuse a variety of communications protocols (e.g., BACnet, IP, LON, etc.).

Communications interface 708 may be a network interface configured tofacilitate electronic data communications between data set abnormalitycontroller 700 and various external systems or devices (e.g., buildingequipment 720, analyst device 722, user device 724, etc.). For example,data set abnormality controller 700 may receive vibration data sets frombuilding equipment 720 via communications interface 708.

Processing circuit 702 is shown to include a processor 704 and memory706. Processor 704 may be a general purpose or specific purposeprocessor, an application specific integrated circuit (ASIC), one ormore field programmable gate arrays (FPGAs), a group of processingcomponents, or other suitable processing components. Processor 704 maybe configured to execute computer code or instructions stored in memory706 or received from other computer readable media (e.g., CDROM, networkstorage, a remote server, etc.).

Memory 706 may include one or more devices (e.g., memory units, memorydevices, storage devices, etc.) for storing data and/or computer codefor completing and/or facilitating the various processes described inthe present disclosure. Memory 706 may include random access memory(RAM), read-only memory (ROM), hard drive storage, temporary storage,non-volatile memory, flash memory, optical memory, or any other suitablememory for storing software objects and/or computer instructions. Memory706 may include database components, object code components, scriptcomponents, or any other type of information structure for supportingthe various activities and information structures described in thepresent disclosure. Memory 706 may be communicably connected toprocessor 704 via processing circuit 702 and may include computer codefor executing (e.g., by processor 704) one or more processes describedherein. In some embodiments, one or more components of memory 706 arepart of a singular component. However, each component of memory 706 isshown independently for ease of explanation.

Memory 706 is shown to include a data set collector 710. Data setcollector 710 can be configured to receive vibration data sets frombuilding equipment 720 (e.g., via communications interface 708).Building equipment 720 can include any equipment that operates to affecta variable state or condition of a building and/or other space.Specifically, building equipment 720 can operate to affect environmentalconditions of the building and/or other space. As such, buildingequipment 720 may include, for example, chillers, boilers, air handlingunits, fire suppression equipment, etc. In some embodiments, buildingequipment 720 includes some and/or all of the subsystems of buildingsubsystems 428 as described with reference to FIG. 4.

In some embodiments, vibration data sets are generated by sensorsaffixed to devices of building equipment 720 and/or otherwise capable ofobtaining vibrational measurements of building equipment 720. A typicalvibration data set may include timewave data indicating accelerationover time. In some embodiments, the timewave data is collected byaccelerometers on different physical points on a building device. Forexample, a data set for a chiller may include vibration signalscollected from locations of the chiller such as a compressor, an off-endmotor, and a drive-end motor. In this example, vibration data can becollected in three sensor orientations (e.g., X, Y, and Z directions ofthree-dimensional space), thereby generating 9 timewaves in total. Eachof the timewaves can be evaluated by a ML model (or multiple ML models)for accurate anomaly detection. This can ensure that if equipment faultsare only detectable at certain locations and/or orientations of thedevice, the faults can nonetheless be detected. In some embodiments, thevibration data sets also includes information such as machine metadata,machine operating conditions, one or more time waveforms, relevantmachine specifications (e.g., a line frequency, a number of impellerblades, a gear ratio), etc. Additional information other than rawvibration signals can help the ML model in determining frequencies andranges where vibration signals may be expected. Vibration data sets aredescribed in greater detail in U.S. patent application Ser. No.15/993,331 filed May 30, 2018, the entirety of which is incorporated byreference herein. Vibration data sets are also described in greaterdetail in U.S. patent application Ser. No. 16/413,892 filed May 16,2019, the entirety of which is incorporated by reference herein. In someembodiments, the systems and methods described herein can be implementedwith the systems and methods described in the incorporated patentapplications.

In some embodiments, data set collector 710 stores collected vibrationdata sets in a database 726. Database 726 is shown as a component ofdata set collector 710 for ease of explanation. Database 726 may be aseparate component of data set abnormality controller 700 and/or may beseparate from data set abnormality controller 700 altogether. Forexample, database 726 may be hosted by a cloud provider and hosted on acloud computation system that data set abnormality controller 700 cancommunicate with. In this case, data set collector 710 may transmit andreceive vibration data sets to and from the cloud computation system viacommunications interface 708. In any case, by storing vibration datasets in database 726, the vibration data sets can be saved and laterused for other processes such as retraining an ML model for detectingabnormalities, displaying vibration data sets to analysts, etc.

Data set collector 710 can provide vibration data sets to data setpreparation module 712. Data set preparation module 712 can preparevibration data sets for being used as input to ML models 714. Dependenton a format of ML models 714, some ML models of ML models 714 mayrequire vibrational data to be presented as input in a format other thanraw vibration signals. As such, data set preparation module 712 canmanipulate vibration data sets received from data set collector 710 toensure data provided to ML models 714 is in a proper format and includesuseful information.

In some embodiments, data set preparation module 712 performs fastFourier transforms (FFTs) for each timewave associated with a vibrationdata set. The FFTs can represent the timewaves in a frequency domainsuch that the vibration data sets can be more easily processed by MLmodels 714. In some embodiments, each FFT for a timewave is calculatedwith a certain frequency range and resolution. In this way, specificequipment abnormalities can be identified and resolved. For example,motor shaft issues may only be detectable at lower frequencies and gearset faults may only be detectable at high frequencies. As such, data setpreparation module 712 can compute an FFT that captures low frequencyranges to detect motor shaft issues and can compute an FFT that captureshigh frequency ranges at which the gear set faults are detectable.

As a result of performing the FFTs, FFT spectra can be generated by dataset preparation module 712 for a vibration data set. An FFT spectrum mayinclude compiled results of individual FFTs performed on the vibrationdata set. Each FFT spectrum may be specific to a particular range offrequencies and resolution. The particular range of frequencies andresolution for a particular FFT spectra can define a “type” of the FFTspectra. The FFT spectra can be provided to machine learning models 714as inputs.

It should be noted that FFTs are given as an example of data preparationthat can be performed to prepare vibration data sets to be inputted toML models 714. Computing FFTs for individual timewaves and using FFTspectra as input to ML models 714 can be useful if a large amount ofhistorical data is unavailable. In some embodiments, other approachesfor data preparation are utilized. For example, ML models 714, asdescribed in detail below, may utilize time domain data as input. Inthis case, data set preparation module 712 can manipulate vibration datasets to be in a proper time domain format for input to ML models 714. Asanother example, data set preparation module 712 may perform discretecosine transforms on the vibration data sets such that the vibrationdata sets can be analyzed by ML models 714. In general, data setpreparation module 712 can perform processing on vibration data setsreceived from data set collector 710 to ensure input to ML models 714 isin a proper format. In some embodiments, if ML models 714 use rawvibration signals as input, data set preparation module 712 may or maynot be a component of memory 706. In some embodiments, ML models 714directly utilize timewave data as inputs to analyze vibration data setswhich may or may not require data preparation by data set preparationmodule 712.

ML models 714 can include one or more ML models that can determineprobabilities that a vibration data set includes at least oneabnormality based on FFT spectra. For example, an ML model of ML model714 may predict that a first vibration data set has a 30% probability ofincluding an abnormality whereas a second vibration data set has a 70%probability of including an abnormality. In some embodiments, ML models714 output a different indicator of abnormalities in vibration datasets. For example, an ML model of ML models 714 may output a binarydecision (e.g., yes or no) indicating whether or not the ML modelpredicts that a vibration data set includes an abnormality.

ML models 714 can provide additional information for analysts toconsider if evaluating machine health of building equipment 720. Insightprovided by ML models 714 may include predicted health scores forspecific machine components, a determination of important machinespeeds, highlighting of regions of vibration spectra that needattention, etc. In this way, analyst efficiency in analyzing vibrationdata sets can increase by providing additional information beyond rawvibration data.

ML models 714 can also assess a condition of an entire device andindicate whether the device is functioning normally, or if the device ispotentially abnormal and should be evaluated by a human analyst. In thisway, ML models 714 can eliminate some vibration data sets from needingto be analyzed by an analyst, thereby increasing efficiency of theanalyst. In some embodiments, if enough data is available, ML models 714can be trained to automatically and accurately diagnose fault buildingequipment. However, if accuracy of all decisions is of high priority(e.g., to a user), some and/or all vibration data sets identified asbeing potentially abnormal may be evaluated by human analysts to ensurethat diagnoses of equipment problems are accurate.

ML models 714 can may include a variety of ML models generated forvarious building devices of building equipment 720. For example, MLmodels 714 may include ML models for identifying/predictingabnormalities in vibration data sets for chillers, pumps, fans, etc.Generating models for different building equipment may be important ifmultiple devices are analyzed as certain devices may be associated withmore vibrations as opposed to others. In other words, a normal amount ofvibration for one building device may not be the same for a separatebuilding device (e.g., a normal amount of vibration for a chiller maynot be the same as for a boiler). As such, each building device and/orbuilding device type can have a separate ML model for analyzingvibration data. In any case, an ML model of ML models 714 can evaluatevibration data collected from a building device and determine whetherany of the vibration spectra (i.e., the FFT spectra) for the buildingdevice are abnormal. Results from vibration spectra can be aggregated todetermine whether the entire dataset may be abnormal. In this way,output of ML models 714 can be used to filter out vibration datasetsthat are “normal” and do not need to be evaluated by a human analyst. Insome embodiments, ML models 714 further detect specific types of faultsor machine malfunctions, as opposed to generic abnormalities.

In some embodiments, the ML models of ML models 714 are convolutionalneural networks (CNNs). CNNs can be useful particularly problems wherelocal relationships within input data are important (e.g., imageclassification tasks). In other words, CNNs can be useful in cases whererepeating patterns exist throughout a sample input. While analysis ofvibration spectra may be complex, signatures of abnormal equipmentfunction can often be detected visually in the frequency domain. Assuch, CNN models can be utilized to identify abnormal vibration signalscan reliably automate a portion of vibration analysis. As describedabove, reduction in a number of data sets manually analyzed by analystscan allow the analysts to focus on suspected abnormal equipment and thusaccommodate a larger volume of data. In terms of ML models 714, the CNNsmay be used to classify one-dimensional inputs.

CNNs can include convolutional layers, activation layers, poolinglayers, and fully connected layers. A convolutional layer can include anumber of filters that can learn different features from an input. Withspecific regard to ML models 714, the filters may learn to recognize,for example, FFT peaks and peak patterns, regardless of whether theyappear in input. Convolutional layers may result in parameter sharing aspeaks and spectral patterns may repeat throughout an FFT spectrumsample.

Activation layers of CNNs can apply an activation function to theirinputs. With regards to CNNs of ML models 714, the CNNs can utilizerectified linear unit (ReLU) activation layers why can apply thefollowing activation function:f(x)=max(0,x)where x is some input value.

Pooling layers of CNNs can downsample their input to decrease acomplexity of the CNN model. Specifically, downsampling can reduce anumber of parameters of the CNN model. For example, pooling layers maytake maximum values across small regions of the input to reduce a numberof variables across each small region to one (i.e., the maximum value).

Fully connected layers of CNNs can operate as ordinary neural networksand can be used at the end of a CNN to output a final class score. Inthis way, the fully connected layers can output abnormalityprobabilities based on the FFT spectra received from data setpreparation module 712.

Each spectrum one-dimensional CNN models of ML models 714 can evaluateone type of FFT of the FFT spectra provided by data set preparationmodule 712. Machine specs and spectrum-specific info (e.g., location andorientation of a sensor that made the vibration measurement) can beincorporated in the final layers of each model. Spectrum CNN models canbe trained on labeled historical data that is available (e.g., stored indatabase 726) so that the spectrum CNN models output a probability thata given spectrum is abnormal (i.e., is indicative of a machine fault).In some embodiments, the spectrum CNN models further predict a specifictype of machine fault that is present based on the FFT spectra. Forexample, the spectrum CNN models may learn to associate certain FFTspectra patterns with specific component failures. An example of CNNmodels that can be used to predict probabilities based on FFT spectra isdescribed below with reference to FIG. 10.

To achieve good performance of abnormality predictions, CNN models of MLmodels 714 may require a large amount of training data. However,obtaining a large number of labeled vibration datasets may not feasiblefor all equipment types, and so, data availability may be a limitingfactor for extending the anomaly detection models. To mitigate dataavailability problems, the CNN models may be trained using transferlearning. With transfer learning, an ML model can be trained on one setof data and then applied to a separate set of data for which there maybe significantly less data. The ML model can be fine-tuned on the newset of data, but the performance is helped significantly by what the MLmodel learns from the first set of data. Transfer learning may workespecially well if fundamental features the CNN learns (e.g., FFT peaks)are the same for the two data sets.

As an example of transfer learning that can be used in training theCNNs, a spectrum CNN model for a first chiller type may be trained basedat least partially on vibration data sets for a second chiller type. Inthis case, the spectrum CNN model can be trained based on the vibrationdata sets and/or CNN models for the second chiller type and fine-tunedbased on vibration data sets for the first chiller type. Specifically,the spectrum CNN model can be initially trained based on the vibrationdata sets for the second chiller type. Some of the learned weights ofthe spectrum CNN model can be fixed prior to fine-tuning based onvibration data sets for the first chiller type. In this case, a numberof layers of the spectrum CNN model that are fixed can be configurableby testing what layers being fixed results in the best performance. Inthis way, the spectrum CNN model can be trained to predict abnormalitiesin vibration data sets for the first chiller type using data for thesecond chiller type.

It should be appreciated that CNNs are given purely for sake of example.The ML models of ML models 714 can be based on any appropriate type ofmachine learning model that can be used to classify vibration data sets.For example, ML models 714 may include long short-term memory (LSTM)models, other recurrent neural networks, etc. Dependent on a type of MLmodel used, data set preparation module 712 may or may not be includedin data set abnormality controller 700. Further, data set preparationmodule 712 may perform other operations as opposed to and/or in additionto FFTs. In this sense, data set preparation module 712 can beconfigured and customized to prepare data in a format that can be usedas input by ML models 714.

In some embodiments, ML models 714 are optimized for recall (apercentage of faulty machines ML models 714 are able to detect) orprecision (a percentage of building devices that ML models 714 classifyas faulty that are actually faulty). As ML models 714 catch more fault(i.e., recall increases), a higher number of “false alarms” (i.e.,building devices identified as faulty that are operating normally) mayincrease as well. In other words, as recall increases, precision maydecrease and vice-versa.

Model performance of ML models 714 can be tuned by adjusting aprobability threshold used to assign normal and abnormal labels tovibration data sets. A higher threshold may result in lower recall andfewer false positives, whereas a lower threshold may achieve high recall(e.g., near 100% recall) but may have more false positives. If a goal ofa user and/or data set abnormality controller 700 is to catch as manyequipment faults as possible (i.e., near-100% recall) and ensure nocritical faults are missed by ML models 714, the probability thresholdmay be lowered to a value that helps decrease a probability of missedequipment faults. However, the probability threshold may be required tobe over a predetermined minimum value (e.g., 10%, 20%, 50%, etc.) suchthat a number of vibration data sets manually analyzed by analysts isreduced. If an extremely low probability threshold is used (e.g., 0%,1%, etc.), a large number of vibration data sets that can be safelyclassified as normal may be unnecessarily qualified as abnormal, therebyincrease a workload on analysts. In other words, the probabilitythreshold should be set (e.g., by a user, by data set abnormalitycontroller 700, etc.) such that a number of “acceptable” data sets(i.e., data sets that do not indicate a fault) classified as normal byML models 714 is maximized while a number of non-acceptable data sets(i.e., data sets that indicate a fault) classified as normal by MLmodels 714 is minimized.

In some embodiments, the probability threshold is selected respective totypes of equipment faults that can occur. For example, equipment faultsmay be classified as either “alert” faults (i.e., minor faults) or“alarm”/“danger” faults (i.e., critical faults). In this case, alertfaults may indicate some fault that may, for example, raise operationalcosts, but would not be catastrophic to a system if left unaccountedfor. Alarm/danger faults, however, may indicate equipment faults that,if left unaccounted for, may result in very large increases inoperational costs, system failure, and/or other significant outcomes fora system. Based on the equipment fault classifiers, the probabilitythreshold for ML models 714 can be set respective of the classifiers.For example, a conservative probability threshold may be set such thateffectively no alert faults or alarm/danger faults are misclassified asnormal. As another example, a less conservative probability thresholdfor ML models 714 may be set such that a few alert faults may bemisclassified but that no alarm/danger fault are misclassified. In someembodiments, the probability threshold is automatically adjusted by dataset abnormality controller 700 based on feedback aboutmisclassifications from a user and based on a tolerance formisclassified faults and false positives set by the user (or some otherentity).

As a result of passing an FFT spectra for a vibration data set throughML models 714, a set of abnormality probabilities for the FFT spectracan be calculated and provided to an abnormality identifier 716. For agiven FFT spectrum, a specific ML model associated with a frequencyrange (or other aspect) of the FFT spectrum can analyze the FFT spectrumto determine a probability that the FFT spectrum is abnormal. Thisprocess can be repeated for each FFT spectrum of the vibration data setsuch that abnormality identifier 716 can receive an abnormalityprobability for each FFT spectrum.

Based on a received set of abnormality probabilities for a vibrationdata set, abnormality identifier 716 can identify/determine whether thevibration data set is abnormal. Abnormality identifier 716 can identifywhether the vibration data set is normal or abnormal through a varietyof methods. In some embodiments, abnormality identifier 716 determineswhether the vibration data set is normal or abnormal by identifying amaximum abnormality probability included in the set of abnormalityprobabilities. For example, if the FFT spectra of the vibration data setincluded three FFT spectrums which have respective abnormalityprobabilities of 10%, 30%, and 60% as determined by ML models 714,abnormality identifier 716 may identify 60% as the maximum abnormalityprobability. Abnormality identifier 716 can determine whether themaximum abnormality probability is greater than or equal to a thresholdprobability for abnormality and, if the maximum abnormality is greaterthan or equal to the threshold probability, can identify the vibrationdata set as abnormal. Taking the maximum abnormality probability of areceived set of abnormality probabilities can be a computationallysimple process and can ensure that the vibration data set is treatedcautiously to reduce a change of mislabeling the vibration data set asnormal if the vibration data set is abnormal.

In some embodiments, abnormality identifier 716 determines a label forthe vibration data set based on a model. In this case, abnormalityidentifier 716 can provide each abnormality probability of the receivedset of abnormality probabilities to the model to determine whether toclassify the vibration data set as normal or abnormal. The model used byabnormality identifier 716 may include a supervised learning algorithmsuch as, for example, a logistic regression model, a support vectormachine (SVM) model, decision trees, etc. Specifically, the model usedby abnormality identifier 716 can determine a final probability based oneach abnormality probability and can compare the final probability tothe threshold probability. Using the model can be helpful in moreaccurately classifying vibration data sets as normal or abnormal. Inparticular, using the model in abnormality identifier 716 can reduce animpact of high outlier probabilities in the set of abnormalityprobabilities. For example, if a first FFT spectrum is associated withan abnormality probability of 80% whereas all other FFT spectraassociated with a vibration data set have an abnormality probabilityless than 5%, the first FFT spectrum may have been misidentified by anML model of ML models 714. In this example, using the maximumprobability may unnecessarily qualify the vibration data set as abnormalwhereas the model may determine a final probability that qualifies thevibration data set as normal.

The model utilized by abnormality identifier 716 can be trained to learnwhich features are particularly important for arriving at a correctlabel of normal or abnormal for a vibration data set. In someembodiments, the model accounts for differences in how the outputprobabilities of different models of ML models 714 are calibrated. Insome embodiments, the model accounts for additional information such asmachine specification values (e.g., gear ratio, line frequency, etc.) tobetter classify vibration data sets.

In some embodiments, abnormality identifier 716 includes business logicand/or auditing capabilities for further analyzing vibration data sets.In effect, abnormality identifier 716 may include any appropriatefunctionality for labeling vibration data sets as normal or abnormal.Abnormality identifier 716 is described in greater detail below withreference to FIG. 8.

Based on a received set of abnormality probabilities, abnormalityidentifier 716 can label an associated vibration data set as normal orabnormal. If abnormality identifier 716 labels the vibration data set asnormal, the vibration data set can be provided to a report generator 718as described in greater detail below. However, if abnormality identifier716 labels the vibration data set as abnormal, abnormality identifier716 can provide the abnormal vibration data set to an analyst device722.

Analyst device 722 can be any device associated with an analyst that canallow the analyst to view a vibration data set and provide feedbackabout the vibration data set. As such, analyst device 722 may includeone or more personal computing devices associated with the analyst.Analyst device 722 may include any wearable or non-wearable device.Wearable devices can refer to any type of device that an individualwears including, but not limited to, a watch (e.g., a smart watch),glasses (e.g., smart glasses), bracelet (e.g., a smart bracelet), etc.Analyst device 722 may also include any type of mobile device including,but not limited to, a phone (e.g., smart phone), a tablet, a personaldigital assistant, etc. In some embodiments, analyst device 722 includesother computing devices such as a desktop computer, a laptop computer,etc. Analyst device 722 can be configured to display a graphical userinterface including vibration data sets to the analyst and receive userinput to the graphical user interface. In some embodiments, analystdevice 722 includes a touchscreen. Analyst device 722 may becommunicable with the data set abnormality controller 700 via a network,for example a WiFi network, a Bluetooth network, a cellular network,etc.

Via analyst device 722, the analyst can provide analyst feedback.Specifically, the analyst may indicate whether a vibration data setclassified as abnormal by abnormality identifier 716 is actuallyabnormal in the opinion of the analyst. If the analyst indicates thevibration data set is normal, the vibration data set can be provided toreport generator 718 such that report generator 718 can generate a“normal” report. However, if the analyst indicates the vibration dataset is correctly classified as abnormal by abnormality identifier 716,various corrective actions may be taken to address the abnormality. Insome embodiments, one corrective action is to provide the abnormal dataset to report generator 718 to generate a report detailing theabnormality. In some embodiments, corrective actions such asmaintenance, replacement, and/or other repairs of building equipment 720may be initiated. For example, a specific building device of buildingequipment 720 may be scheduled to be replaced based on the analystindicating an abnormality exists. Corrective actions may be initiated bythe analyst via analyst device 722, automatically by abnormalityidentifier 716 and/or another component of data set abnormalitycontroller 700, and/or by any other entity authorized to initiatecorrective actions. In some embodiments, abnormality identifier 716initiates a corrective action upon identifying the vibration data set asabnormal. In some embodiments, however, abnormality identifier 716 maybe restricted in what corrective actions can be taken prior toconfirming abnormality with the analyst. In this case, providing thevibration data set to the analyst may be considered a corrective action.Other valid corrective actions the abnormality identifier 716 mayinitiate may include providing the vibration data set to reportgenerator 718 to generate an initial abnormal report for the vibrationdata set, alerting a user of user device 724 that abnormality may bepresent, etc. Abnormality identifier 716 may be restricted, for example,from initiating a corrective action to replace building equipment beforeconfirming abnormality with the analyst.

In some embodiments, abnormality identifier 716 provides abnormal datasets to multiple analyst devices 722. In this case, multiple analystscan review the abnormal data sets and provide feedback. Providingabnormal data sets to multiple analysts can reduce a chance thatvibration data sets are mislabeled by analysts. For example, one analystmay accidentally misinterpret an abnormal data set provided byabnormality identifier 716 as normal, thereby missing an equipmentfault. However, if the abnormal data set is provided to multipleanalysts, the other analysts may detect the equipment fault in theabnormal data set. In some embodiments, if multiple analysts providefeedback on a supposedly abnormal data set, a predetermined percentageof analysts (e.g., 10% of analysts, 30% of analysts, 60% of analysts,etc.) may be required to indicate the supposedly abnormal data is trulyabnormal for a corrective action to be initiated. In some embodiments,only one analyst (or another predetermined number of analysts) isrequired to indicate abnormality in a data set for a corrective actionto be initiated.

Labeled vibration data sets can be provided to report generator 718.Based on a vibration data set, report generator 718 can automaticallygenerate a report that can be provided to a user (e.g., a customer) ofuser device 724. In some embodiments, user device 724 is similar toand/or the same as analyst device 722. As such, user device 724 may beor include, for example, wearable devices, desktop computers, mobiledevices, etc.

If a received vibration data set is labeled as normal, report generator718 may generate a normal report indicating that building equipment isoperating normally. If a received vibration data is labeled as abnormal(e.g., as indicated by an analyst), report generator 718 may generate anabnormal report detailing the abnormality. Abnormal reports may includevarious information that may be helpful to the user. For example, theabnormal report may include what building device of building equipment720 is experiencing a fault, possible corrective actions that can betaken to address the fault, etc. In effect, the abnormal report caninclude any information that can help the user make an informed decisionon how to proceed with regards to the fault.

Referring now to FIG. 8, a block diagram of abnormality identifier 716in greater detail is shown, according to some embodiments. Abnormalityidentifier 716 is shown to include a maximum probability identifier 802and an abnormality model 804. Maximum probability identifier 802 andabnormality model 804 are examples of components that abnormalityidentifier 716 may include to label vibration data sets based on a setof abnormality probabilities. Specifically, maximum probabilityidentifier 802 may label vibration data sets based on a maximumprobability in associated sets of abnormality probabilities whereasabnormality model 804 may described a supervised learning algorithm(e.g., a logistic regression, an SVM, decision trees, etc.) that canlabel vibration data sets based on sets of abnormality probabilitiesand/or other information. Maximum probability identification and modelsfor detecting abnormalities are described in greater detail above withreference to FIG. 7.

Abnormality identifier 716 is also shown to include a business logicmodule 806. Business logic module 806 can perform an analysis toincorporate business logic to further ensure that vibration data setsare not indicative of building equipment faults. Business logic module806 can account for business logic that may need to be considered beforea vibration data set can be automatically labeled. Business logic module806 can analyze a single set of data (e.g., a set of abnormalityprobabilities) with the context of past analysis results for data setabnormality controller 700. If the current data is acceptable/normal,but the previous set of data was not normal, additional care may need tobe taken with how the data is communicated to the end customer and howvibration data sets are analyzed. For example, business logic module 806may account for questions such as, “were any repairs performed” or “werethere any changes in operating conditions.” If, for example, a previousvibration data set was labeled as abnormal and a current vibration dataset is so far normal (e.g., as indicated by maximum probabilityidentifier 802 and/or abnormality model 804) but no maintenance hasoccurred, further analysis may be required. In this case, analysis maybe useful to determine why vibrational data has changed from appearingabnormal to appearing normal. Other business logic that can be accountedfor by business logic module 806 may include, for example, changes tohow customers desire vibration data sets to be labeled, if any operationconditions have changed, etc.

Abnormality identifier 716 is also shown to include a model auditor 808.Model auditor 808 can performed an auditing process to test performanceof abnormality model 804. Model auditor 808 may test performance ofabnormality model 804 periodically, after a certain amount of vibrationdata sets are analyzed, responsive to a user/analyst request forauditing, etc.

For model auditor 808 to perform the auditing process, a vibration dataset will need to capture that it has been approved by abnormality model804 and has passed a business logic test performed by business logicmodule 806, but that it was flagged for audit. Based on the audit flag,model auditor 808 can go back and have the vibration data set analyzedby an analyst. If the vibration data set passes human analysis, thenmodel auditor 808 may determine abnormality model 804 worked correctly.However, if the vibration data set fails the human analysis process(i.e., the analyst indicates the vibration data set is abnormal), thenabnormality model 804 should be reviewed. It should be noted that theauditing performed by model auditor 808 should take place after thebusiness logic test performed by business logic module 806, because ifthe business logic test fails, then the human analysis result mightdiffer for reasons not related to the current set of data, which is nottested for. It should also be noted that, if abnormality model 804 isnot used to label vibration data sets (e.g., if maximum probabilityidentifier 802 is used to label vibration data sets), model auditor 808may or may not be a component of abnormality identifier 716.

Components of abnormality identifier 716 shown in FIG. 8 are providedpurely for sake of example. Abnormality identifier 716 can include anyrelevant components for performing abnormality identification ofabnormality probabilities for vibration data sets.

Referring now to FIG. 9, a flow diagram of a process 900 for generatingreports for a vibration data set is shown, according to someembodiments. Process 900 can outline how data set abnormality controller700 can operate to analyze a vibration data sets to determine if thevibration data set is normal or abnormal. As such, some and/or all stepsof process 900 may be performed by data set abnormality controller 700and/or components therein.

Process 900 is shown to include receiving a vibration data set (step902). The vibration data set can include raw vibration measurements of abuilding device. The raw vibration measurements may indicate how thebuilding device is vibrating in three-dimensional space at one or morelocations across the building device as indicated by timewaves. Thetimewaves can indicate acceleration over time measurements of thebuilding device. In some embodiments, step 902 is performed by data setcollector 710.

Process 900 is shown to include performing a fast Fourier Transform(FFT) on each timewave of the vibration data set to generate an FFTspectra (step 904). Performing FFTs on the timewaves can help representthe timewaves in a frequency domain such that the vibration data setscan be more easily processed. The FFT spectra generated in step 904 caninclude one or more individual spectra that describe the timewaves inthe frequency domain for a specific range of frequencies. In someembodiments, step 904 includes performing other operations on thevibration data set dependent on a model format (e.g., CNN, LSTM, etc.)used in later in process 900. In this sense, step 904 can be considereda data preparation step that prepares data use by one or more models. Insome embodiments, step 904 is performed by data set preparation module712.

Process 900 is shown to include determining an abnormality probabilityof each FFT spectrum by passing the FFT spectra through one or moremachine learning models (step 906). In some embodiments, step 906includes an ML model for each range of frequencies associated with theFFT spectra. In this way, each frequency range can have a specialized MLmodel for predicting abnormality probabilities for a given frequencyrange. The one or more ML models can, based on a FFT spectrum, calculatea probability that the FFT spectrum indicates an abnormality of buildingequipment. In some embodiments, step 906 includes generating a set ofabnormality probabilities that includes a probability that each FFTspectrum is abnormal. In some embodiments, step 906 is performed by MLmodels 714.

Process 900 is shown to include analyzing the abnormality probabilitiesto determine whether the vibration data set is normal or abnormal (step908). Step 908 may include various operations to analyze the abnormalityprobabilities. For example, step 908 may include determining a maximumabnormality probability of all abnormality probabilities. In this case,if the maximum abnormality probability is greater than or equal to athreshold probability, the vibration data set may be consideredabnormal. As another example, step 908 may include passing theabnormality probabilities through an additional model that has learnedhow to associate abnormality probabilities to whether a vibration dataset is normal or abnormal. In some embodiments, step 908 is performed byabnormality identifier 716.

Process 900 is shown to include determining if the vibration data set isnormal (step 910). Step 910 can be performed based on the analysisperformed in step 908. If the vibration data set is normal (step 910,“YES”), process 900 can proceed to step 912. If the vibration data setis abnormal (step 910, “NO”), process 900 can proceed to step 914. Insome embodiments, step 910 is performed by abnormality identifier 716.

Process 900 is shown to include generating a normal report for thenormal data set (step 912). If step 912 is performed, the vibration dataset received in step 902 may be normal. As such, a normal data set canbe generated and provided to a user (e.g., a customer) indicating thatbuilding equipment is operating as expected and that no faults aredetected. In some embodiments, if the user indicates they do not wish toreceive reports if no issues are present, step 912 may or may not beincluded in process 900. In some embodiments, step 912 is performed byreport generator 718.

Process 900 is shown to include providing the vibration data set to ananalyst for further review (step 914). If step 914 is performed, theanalyst can be relied upon to provide further feedback regarding whetherthe vibration data set is actually abnormal. Step 914 may includeproviding the vibration data set to an analyst device. In someembodiments, information regarding why the vibration data set waslabeled as abnormal in step 908 is provided to the analyst. For example,the analyst may be provided sections of the FFT spectra that wereidentified as potentially abnormal. In some embodiments, step 914 isperformed by abnormality identifier 716.

Process 900 is shown to include determining if feedback from the analystindicates the vibration data set is normal (step 916). If the analystindicates the vibration data set is normal, process 900 can proceed tostep 912. If the analyst indicates the vibration data set is abnormal,process 900 can proceed to step 918. In some embodiments, step 916 isperformed by abnormality identifier 716.

Process 900 is shown to include initiating a corrective action toaddress abnormality of the vibration data set (step 918). Responsive tothe analyst indicating the data set is abnormal, the corrective actioncan be initiated. The corrective action may include various actions suchas, for example, generating a report indicating the abnormality,scheduling maintenance/repair/replacement of building equipment to beperformed, disabling a building device with a fault, obtaining furtherfeedback from analysts, etc. In some embodiments, step 918 is performedby data set abnormality controller 700.

Referring now to FIG. 10, a flow diagram of an example process 1000 fordetermining whether a vibration data set for a chiller is normal orabnormal is shown, according to some embodiments. In particular, process1000 can illustrate an example of identifying faults of a chiller in avibration data set using multiple models to analyze different aspects ofthe vibration data set. In some embodiments, some and/or all steps ofprocess 1000 are performed by data set abnormality controller 700.

Process 1000 is shown to include receiving a vibration data set (step1002). The vibration data set received in step 1002 can describevibrational data for a chiller, according to some embodiments. In someembodiments, step 1002 is similar to and/or the same as step 902 asdescribed with reference to FIG. 9. In the example of process 1000,historical vibration data may be stored in the form of Fast FourierTransforms (FFTs) calculated from accelerometer data for a standard setof frequency ranges and resolutions. Data can be collected at variousphysical locations and orientations on a device. In particular,high-resolution, low frequency 400 Hz spectra can be used to diagnoseissues with components such as the motor shaft, electrical, andcompressor shaft of the chiller. Lower-resolution, high frequency 20 kHzspectra may provide insight into a condition of an impeller and gearset. Mid-range frequency 3 kHz spectra may indicate ball bearingfunction. In some embodiments, step 1002 is performed by data setcollector 710.

Process 1000 is shown to include computing fast Fourier transforms(FFTs) for each timewave of the vibration data set to obtain an FFTspectra (step 1004). In some embodiments, step 1004 is similar to and/orthe same as step 904 of process 900. With respect to the example ofprocess 1000, step 1004 may result in 21 FFTs being computed based onthe vibration data set. In particular, 1004 may result in identificationof nine 400 Hz spectra, nine 3,000 Hz spectra, and three 20,000 Hzspectra. In some embodiments, step 1004 is performed by data setpreparation module 712.

Process 1000 is shown to include providing the FFT spectra computed instep 1004 to a 400 Hz CNN model 1006, a 3k Hz CNN model 1008, and a 20kHz CNN model 1010. Models 1006-1010 can be used to determineprobabilities that a given frequency range of the FFT spectra include anabnormality. It should be noted that, while models 1006-1010 aredescribed below as convolutional neural networks, models 1006-1010 mayinclude other machine learning models used to generated predictions ofabnormality probabilities.

Prior to receiving the FFT spectra, models 1006-1010 can be trained toproperly predict abnormality probabilities. In some embodiments, models1006-1010 are trained based on a training data set, validated based on avalidation data set used for hyper-parameter and architecture tuning,and a test data set used for performance evaluation of models 1006-1010.Said data sets may be retrieved from a database including historicaldata sets. It should be noted that, performance on the validation dataset can motivate improvements to models 1006-1010 and that the test dataset may be ignored during model-tuning. In the example of process 1000,Only historical vibration datasets that include all 9 400 Hz spectra(i.e., 0.25 Hz resolution for CA, CH, CV, MOA, MOH, MOV, MDA, MDH, MDV),all 9 3000 Hz spectra (i.e., 0.9375 Hz resolution for CA, CH, CV, MOA,MOH, MOV, MDA, MDH, MDV), and all 3 20 kHz spectra (i.e., 6.25 Hzresolution for CA, CH, CV) are considered for the overall ML model,though additional spectra from incomplete datasets may be used fortraining the individual CNN models.

The labels used for training and evaluation of models 1006-1010 maycorrespond to a device condition assigned by vibration analysts. Each ofthe historical datasets can be evaluated by a human analyst. Afteranalyzing the Fourier transforms computed from the accelerometer data asindicated in vibration data sets, an analyst may either designate adevice as being in an “acceptable” condition, or may put the device in“alert,” “alarm,” or “danger” states in increasing level of severity. Ifin an unacceptable condition, the components responsible for theunacceptable condition may also be indicated by the analyst. Forexample, a machine may be put into “alert” because a ball bearing defectis suspected by the analyst. Faults for more than one component may besuspected and indicated in the historical dataset. Based on the datasets, models 1006-1010 can be retrained, validated, and tested to ensuremodels 1006-1010 generate appropriate probability predictions.

With specific regards to 400 Hz CNN model 1006, 400 Hz CNN model 1006can evaluate all 0-400 Hz FFT spectra in the vibration data set. In thecase of process 1000, 9 spectra exist in the 0-400 Hz frequency range.400 Hz CNN model 1006 can utilize various features in generating aprobability output such as, for example, a physical location of a sensoron a device (e.g., on a compressor, on an off-end, on a drive-end,etc.), a physical orientation of the sensor on the device (e.g., axial,horizontal, vertical, etc.), a line frequency in Hz (e.g., 50 Hz, 60Hz), raw spectral data (e.g., a series of amplitudes in IPS for all FFTbins in the spectrum), etc. In this case, physical location,orientation, and line frequency can be one-hot encoded. All auxiliaryfeatures (non-spectral features) can be standardized according to thetraining set distribution. The raw spectral data can be truncated tostart at 25 Hz and scaled by a global amplitude mean and standarddeviation of the training set. Further, it can be assumed by 400 Hz CNNmodel 1006 that all devices have 2-pole motors. If this assumption isinvalid, the number of poles should be included as a feature of 400 HzCNN model 1006.

In some embodiments, 400 Hz CNN model 1006 considers dataset-levellabels assigned by a vibration analyst for certain components of thechiller. For example, 400 Hz CNN model 1006 may consider labels such as“motor shaft,” “electrical,” “low-speed compressor shaft,” and“high-speed compressor shaft.” Each of these numeric component labelscan range from 0 (acceptable) to 3 (danger). A maximum value of the fourlabels can be considered the “full sample label” and can be binarized to0 (acceptable) or 1 (abnormal) for model training. Each spectrumbelonging to the same dataset can be assigned the same label, regardlessof whether abnormal spectral features are visible.

In some embodiments, 400 Hz CNN model 1006 is a one-dimensional CNN withfully-connected layers at the end for classification. Table 1 belowillustrates an example architecture of 400 Hz CNN model 1006. In Table1, “Conv1D” can indicate a one-dimensional convolutional type layer,“MaxPool1D” can indicate a one-dimensional max pooling type layer, and“FC” can indicate a fully connected layer.

TABLE 1 400 Hz CNN Model Architecture Layer Type Filter Count SizeStride Activation 0 Input — 1501 — — 1 Conv1D 32 7 3 ReLU 2 MaxPool1D —3 2 — 3 Conv1D 64 5 1 ReLU 4 MaxPool1D — 3 2 — 5 Conv1D 28 3 1 ReLU 6Conv1D 28 3 1 ReLU 7 Conv1D 28 3 1 ReLU 8 MaxPool1D — 3 2 ReLU 9 FC —200 — ReLU 10 FC — 50 — ReLU 11 FC — 50 — ReLU 12 Output — 1 — Sigmoid

It should be appreciated that in Table 1, all layers use ReLUactivation, except for the binary classification layer which uses“sigmoid.” L2 regularization (lambda=1.0) can be applied to each layer,as well as batch normalization. Auxiliary features (e.g., non-FFTamplitudes) are added to the flattened convolutional features before thefirst fully connected layer. The binary cross-entropy loss can beminimized with an Adam optimization process (lr=1e⁻⁴).

In training 400 Hz CNN model 1006, mini-batches of 512 can be used fortraining such that samples are weighted according to a full samplelabel. In particular, sample labels of 0, 1, 2, and 3 can have sampleweights of 0.1, 0.6, 1.0, and 1.0 respectively. Sample weighting may behelpful in obtaining reasonable performance of 400 Hz CNN model 1006 asa data set used to train 400 Hz CNN model 1006 may be imbalanced (e.g.,85% normal samples and 15% abnormal samples). In this example, 400 HzCNN model 1006 was trained on 113k spectra, validated on 30k spectra,and test on 36k spectra. Model training for 400 Hz CNN model 1006 isstopped if an F1 score of the validation set does not increase in 10epochs. Following hyper-parameter tuning with the validation data set, abest-performing model can be chosen by taking the model with the highestmetric value of precision at a recall of 0.96.

3k Hz CNN model 1008 can evaluate all 0-3000 Hz FFT spectra in adataset. For a typical chiller dataset, there may be 9 3 kHz spectra asshown in process 1000. 3k Hz CNN model 1008 may be relatively similar to400 Hz CNN model 1006. However, 3k Hz CNN model 1008 may only consider asingle dataset label of “ball bearing.” Likewise, an examplearchitecture of 3k Hz CNN model 1008 can be provided in Table 2 below.

TABLE 2 3k Hz CNN Model Architecture Layer Type Filter Count Size StrideActivation 0 Input — 3176 — — 1 Conv1D 32 7 3 ReLU 2 MaxPool1D — 3 2 — 3Conv1D 64 5 1 ReLU 4 MaxPool1D — 3 2 — 5 Conv1D 28 3 1 ReLU 6 Conv1D 283 1 ReLU 7 Conv1D 28 3 1 ReLU 8 MaxPool1D — 3 2 ReLU 9 FC — 200 — ReLU10 FC — 50 — ReLU 11 FC — 50 — ReLU 12 Output — 1 — Sigmoid

As with 400 Hz CNN model 1006, all layers of 3k Hz CNN model 1008 useReLU activation except for the binary classification layer which usedsigmoid. L2 regularization (lambda=100.0) can be applied to each layeras well as batch normalization. In 3k Hz CNN model 1008, a Gaussiannoise layer (0.005) can be placed after the input layer. As with 400 HzCNN model 1006, auxiliary features (e.g., non-FFT amplitudes) can beadded to the flattened convolutional features before the first fullyconnected layer. The binary cross-entropy loss can be minimized with theAdam optimization (lr=1e⁻⁴).

Advantageously, 3k Hz CNN model 1008 can be trained via transferlearning with 400 Hz CNN model 1006. Specifically, model weights forconvolutional layers of 3k Hz CNN model 1008 can be initialized withfinal weights from trained 400 Hz CNN model 1006. Weights forconvolutional layers through layer 3 can be fixed during training.Mini-batches of 1024 can be used for training, where samples areweighted according to their full sample label. Specifically, 3k Hz CNNmodel 1008 may include sample labels 0, 1, 2, and 3 with respectivesample weights of 0.1, 1.0, 1.4, and 1.4. In this case, the dataset maybe imbalanced (91% normal samples and 9% abnormal samples) sosample-weighting may be required for reasonable performance. In thisexample, 3k Hz CNN model 1008 is trained on 113k spectra, validated on30k spectra, and tested on 36k spectra. As with 400 Hz CNN model 1006,model training is stopped if the F1 score of the validation set does notincrease in 10 epochs.

Finally, 20k Hz CNN model 1010 can evaluate all 0-20,000 Hz FFT spectrain a dataset. For a typical chiller dataset, there are 3 20 kHz spectraas shown in process 1000. As with models 1006 and 1008, 20k Hz CNN model1010 can utilize specific features. For example, 20k Hz CNN model 1010may utilize a physical orientation of a sensor on a building device, alinear frequency in Hz, a gear ratio, a number of gear teeth, a numberof impeller blades, and raw spectra data. Further, 20k Hz CNN model 1010may utilize labels including “gear set” and “impeller.” An examplearchitecture of 20k Hz CNN model 1010 can be provided in Table 3 below.

TABLE 3 20k Hz CNN Model Architecture Layer Type Filter Count SizeStride Activation 0 Input — 3193 — — 1 Conv1D 32 7 3 ReLU 2 MaxPool1D —3 2 — 3 Conv1D 64 5 1 ReLU 4 MaxPool1D — 3 2 — 5 Conv1D 28 3 1 ReLU 6Conv1D 28 3 1 ReLU 7 Conv1D 28 3 1 ReLU 8 MaxPool1D — 3 2 ReLU 9 FC —200 — ReLU 10 FC — 50 — ReLU 11 FC — 50 — ReLU 12 Output — 1 — Sigmoid

In 20k Hz CNN model 1010, L2 regularization (lambda=10.0) can be appliedto each layer as well as batch normalization. A Gaussian noise layer(0.03) can be placed after the input layer. As with models 1006 and1008, auxiliary features (e.g., non-FFT amplitudes) can be added to theflattened convolutional features before the first fully connected layer.Likewise, binary cross-entropy loss can be minimized with the Adamoptimization (lr=1e⁻⁴).

As with 3k Hz CNN model 1008, 20k Hz CNN model 1010 can be trained viatransfer learning by initializing the convolutional layers with finalweights from the trained 400 Hz CNN model 1006. Weights forconvolutional layers through layer 5 can be fixed during training. Inthis case, mini-batches of 1024 can be used for training. Samples can beweighted according to their full sample label such that labels 0, 1, 2,and 3 are associated with sample weights 0.1, 2.0, 3.0, and 3.0respectively. The dataset associated with 20k Hz CNN model 1010 isimbalanced (91% normal samples and 9% abnormal samples), and sosample-weighting may be required for reasonable performance. 20k Hz CNNmodel 1010 was trained on 37k spectra, validated on 10k spectra, andtested on 12k spectra. Similar to models 1006 and 1008, model trainingis stopped if the F1 score of the validation set does not increase in 10epochs.

After the appropriate FFT spectra are provided to each of models1006-1010, each of models 1006-1010 can generate a relevant set ofabnormality probabilities. In particular, 400 Hz CNN model 1006 cangenerate 9 probabilities, 3k Hz CNN model 1008 can generate 9probabilities, and 20k Hz CNN model 1010 can generate 3 probabilities.

Process 1000 is shown to include selecting a maximum probability (step1012). The outputs of the three spectrum models 1006-101 (400 Hz, 3 kHz,20 kHz) can be combined to arrive at the final condition score for themachine. In step 1012, a maximum probability value can be assigned tothe 21 spectra as the overall probability that the vibration data set isabnormal. In some embodiments, step 1012 is performed by abnormalityidentifier 716.

Process 1000 is shown to include determining if the maximum probabilityexceeds a threshold (step 1014). If the maximum probability valueexceeds the probability threshold (step 1014, “YES”), process 1000 canproceed to step 1016. If the probability is below the threshold (step1014, “NO”), process 1000 may proceed to step 1018. The probabilitythreshold can be chosen using the training set with consideration toperformance trade-offs. For example, a threshold of 0.4108 maycorrespond to a 70% false positive rate for the training data set andmay result in automatically passing through 30% of acceptable (normal)data sets. In some embodiments, step 1014 is performed by abnormalityidentifier 716.

Process 1000 is shown to include labeling the vibration data set asabnormal (step 1016). If the vibration data set is labeled as abnormal,the vibration data set may be effectively flagged for analyst review. Insome embodiments, step 1016 is performed by abnormality identifier 716.

Process 1000 is shown to include labeling the vibration data set asnormal (step 1018). Data sets labeled as normal (acceptable) may bypasshuman review and move directly to the automatic report generation. Insome embodiments, step 1018 is performed by abnormality identifier 716.

Referring now to FIG. 11, is a flow diagram of a process 1100 forlabeling vibration data sets as normal or abnormal is shown, accordingto some embodiments. In some embodiments, process 1100 is similar toprocess 1000. As such, process 1100 is shown to include steps 1002-1004and models 1006-1010 of process 1000. In some embodiments, process 1100is performed by data set abnormality controller 700.

Process 1100 is shown to include passing the probabilities through afinal machine learning model to label the vibration data set as normalor abnormal (step 1112). Unlike process 1000, process 1100 can utilizean additional machine learning model that can generate a finalprobability based individual probabilities determined by models1006-1010. The final ML model may be or include, for example, a logisticregression, an SVM, decision trees, etc. Advantageously, the final MLmodel can be trained to account for additional considerations such ashow each of models 1006-1010 were trained, what spectra are mostassociated with faults, etc. In this way, the final ML model can gathera more complete picture of building equipment faults as supposed tousing the maximum probability of all probabilities as described inprocess 1000. In some embodiments, step 1112 is performed by ML models714.

Configuration of Exemplary Embodiments

The construction and arrangement of the systems and methods as shown inthe various exemplary embodiments are illustrative only. Although only afew embodiments have been described in detail in this disclosure, manymodifications are possible (e.g., variations in sizes, dimensions,structures, shapes and proportions of the various elements, values ofparameters, mounting arrangements, use of materials, colors,orientations, etc.). For example, the position of elements can bereversed or otherwise varied and the nature or number of discreteelements or positions can be altered or varied. Accordingly, all suchmodifications are intended to be included within the scope of thepresent disclosure. The order or sequence of any process or method stepscan be varied or re-sequenced according to alternative embodiments.Other substitutions, modifications, changes, and omissions can be madein the design, operating conditions and arrangement of the exemplaryembodiments without departing from the scope of the present disclosure.

The present disclosure contemplates methods, systems and programproducts on any machine-readable media for accomplishing variousoperations. The embodiments of the present disclosure can be implementedusing existing computer processors, or by a special purpose computerprocessor for an appropriate system, incorporated for this or anotherpurpose, or by a hardwired system. Embodiments within the scope of thepresent disclosure include program products comprising machine-readablemedia for carrying or having machine-executable instructions or datastructures stored thereon. Such machine-readable media can be anyavailable media that can be accessed by a general purpose or specialpurpose computer or other machine with a processor. By way of example,such machine-readable media can comprise RAM, ROM, EPROM, EEPROM, CD-ROMor other optical disk storage, magnetic disk storage or other magneticstorage devices, or any other medium which can be used to carry or storedesired program code in the form of machine-executable instructions ordata structures and which can be accessed by a general purpose orspecial purpose computer or other machine with a processor. Combinationsof the above are also included within the scope of machine-readablemedia. Machine-executable instructions include, for example,instructions and data which cause a general purpose computer, specialpurpose computer, or special purpose processing machines to perform acertain function or group of functions.

Although the figures show a specific order of method steps, the order ofthe steps may differ from what is depicted. Also two or more steps canbe performed concurrently or with partial concurrence. Such variationwill depend on the software and hardware systems chosen and on designerchoice. All such variations are within the scope of the disclosure.Likewise, software implementations could be accomplished with standardprogramming techniques with rule based logic and other logic toaccomplish the various connection steps, processing steps, comparisonsteps and decision steps.

What is claimed is:
 1. A building management system comprising: buildingequipment operable to affect a variable state or condition of abuilding; a controller comprising a processing circuit configured to:obtain a vibration data set related to vibrations of the buildingequipment; analyze the vibration data set by one or more machinelearning models to generate a set of probabilities, the set ofprobabilities related to a probability that the vibration data set isabnormal; identify the vibration data set as normal or abnormal based onthe set of probabilities; and initiate a corrective action responsive toidentifying the vibration data set as abnormal; wherein identifying thevibration data set as normal or abnormal comprises at least one of:determining whether a maximum probability of the set of probabilitiesexceeds a threshold probability; or providing the set of probabilitiesto a model configured to label the vibration data set as normal orabnormal based on the set of probabilities.
 2. The building managementsystem of claim 1, wherein the processing circuit is configured to:perform one or more fast Fourier transforms on the vibration data set togenerate a fast Fourier transform (FFT) spectra; wherein analyzing thevibration data set comprises providing the FFT spectra to the one ormore machine learning models to generate the set of probabilities. 3.The building management system of claim 2, wherein the one or moremachine learning models comprise one or more convolutional neuralnetworks configured to analyze one or more frequency ranges of the FFTspectra for abnormalities.
 4. The building management system of claim 1,wherein the processing circuit is configured to: provide the vibrationdata set to an analyst responsive to identifying the vibration data setas abnormal; and obtain analyst feedback from the analyst indicatingwhether the analyst believes the vibration data set is abnormal; whereinthe corrective action is initiated based on the analyst indicating thevibration data set is abnormal.
 5. The building management system ofclaim 1, wherein the processing circuit is configured to: generate areport responsive to identifying the vibration data set as normal orabnormal; and provide the report to a user device.
 6. The buildingmanagement system of claim 1, wherein the corrective action comprises atleast one of: scheduling maintenance or replacement for the buildingequipment; generating an abnormal report describing abnormality in thevibration data set; or disabling the building equipment.
 7. A method foranalyzing vibration data sets of equipment, the method comprising:obtaining a vibration data set related to vibrations of the equipment;analyzing the vibration data set by one or more machine learning modelsto generate a set of probabilities, the set of probabilities related toa probability that the vibration data set is abnormal; identifying thevibration data set as normal or abnormal based on the set ofprobabilities; and initiating a corrective action responsive toidentifying the vibration data set as abnormal; wherein identifying thevibration data set as normal or abnormal comprises at least one of:determining whether a maximum probability of the set of probabilitiesexceeds a threshold probability; or providing the set of probabilitiesto a model configured to label the vibration data set as normal orabnormal based on the set of probabilities.
 8. The method of claim 7,further comprising: performing one or more fast Fourier transforms onthe vibration data set to generate a fast Fourier transform (FFT)spectra; wherein analyzing the vibration data set comprises providingthe FFT spectra to the one or more machine learning models to generatethe set of probabilities.
 9. The method of claim 8, wherein the one ormore machine learning models comprise one or more convolutional neuralnetworks configured to analyze one or more frequency ranges of the FFTspectra for abnormalities.
 10. The method of claim 7, furthercomprising: providing the vibration data set to an analyst responsive toidentifying the vibration data set as abnormal; and obtaining analystfeedback from the analyst indicating whether the analyst believes thevibration data set is abnormal; wherein the corrective action isinitiated based on the analyst indicating the vibration data set isabnormal.
 11. The method of claim 7, further comprising: generating areport responsive to identifying the vibration data set as normal orabnormal; and providing the report to a user device.
 12. The method ofclaim 7, wherein the corrective action comprises at least one of:scheduling maintenance or replacement for the equipment; generating anabnormal report describing abnormality in the vibration data set; ordisabling the equipment.
 13. A controller for analyzing vibration datasets of equipment, the controller comprising: one or more processors;and one or more non-transitory computer-readable media storinginstructions that, when executed by the one or more processors, causethe one or more processors to perform operations comprising: obtaining avibration data set related to vibrations of the equipment; analyzing thevibration data set by one or more machine learning models to generate aset of probabilities, the set of probabilities related to a probabilitythat the vibration data set is abnormal; identifying the vibration dataset as normal or abnormal based on the set of probabilities; andinitiating a corrective action responsive to identifying the vibrationdata set as abnormal; wherein identifying the vibration data set asnormal or abnormal comprises at least one of: determining whether amaximum probability of the set of probabilities exceeds a thresholdprobability; or providing the set of probabilities to a model configuredto label the vibration data set as normal or abnormal based on the setof probabilities.
 14. The controller of claim 13, the operations furthercomprising: performing one or more fast Fourier transforms on thevibration data set to generate a fast Fourier transform (FFT) spectra;wherein analyzing the vibration data set comprises providing the FFTspectra to the one or more machine learning models to generate the setof probabilities.
 15. The controller of claim 14, wherein the one ormore machine learning models comprise one or more convolutional neuralnetworks configured to analyze one or more frequency ranges of the FFTspectra for abnormalities.
 16. The controller of claim 13, theoperations further comprising: providing the vibration data set to ananalyst responsive to identifying the vibration data set as abnormal;and obtaining analyst feedback from the analyst indicating whether theanalyst believes the vibration data set is abnormal; wherein thecorrective action is initiated based on the analyst indicating thevibration data set is abnormal.
 17. The controller of claim 13, theoperations further comprising: generating a report responsive toidentifying the vibration data set as normal or abnormal; and providingthe report to a user device.
 18. The controller of claim 13, wherein thecorrective action comprises at least one of: scheduling maintenance orreplacement for the equipment; generating an abnormal report describingabnormality in the vibration data set; or disabling the equipment.